EBZ7100 Engine Blower Workshop Manual

EBZ7100RH 1076283488%5CEngine_Blower_Workshop_Manual

User Manual: EBZ7100

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Instruction

This workshop manual describes the main maintenance items and procedures and
troubleshooting for the Husqvarna Zenoah engine blower.
This manual is classified into two categories; one includes important notices concerning
disassembly and reassembly including "Cautions for disassembly" and "Cautions for
reassembly", the other includes inspection and adjustment items such as "Muffler inspection
and maintenance", "Air cleaner inspection" and "Carburetor adjustment". After each item is
thoroughly understood, apply the understanding to the actual maintenance tasks.
Frequently asked questions are also included in this manual. However, many cases need rich
maintenance experience and informed judgment. Please refer to this manual for maintenance
support.

【NOTES】
】
1. The contents of this manual are based on specifications as of January 2009.
The contents may be modified due to performance improvement or some other reason
without notice.
2. Use Zenoah brand-name parts when replacing a part during maintenance, etc.
The manufacturer does not bear any responsibility if trouble occurs during parts use of other
than brand-name parts.
3. Read this manual thoroughly before beginning the maintenance work, understand it, apply
the content to the actual maintenance tasks and guide the customer if directions, are
needed.

Exported models according to country
This workshop manual applies to all exported engine blower models sold by Hasqvarna
Zenoah. Some models are not exported to particular regions of the world. Please check your
model by referring the following table.

Table of exported models corresponding to country
Category

Handheld Blower

Displacement

22.5 cm

Engine Type

G23L

JAP

Blower
Model

3

25.4 cm

Backpack Blower
3

GZ25N

GZ30N

41.5 cm

General HB2302

HBZ2601 EBZ3000

EB4300

EU

HBZ2601 EBZ3000

HBZ2601

47.9 cm

3

GZ48N
★

EB4300

HB2302

3

G4K

EBZ3000

USA

HB2311EZ

29.5 cm

3

50.2 cm3

62.0 cm3

64.9 cm3

71.9 cm3

GZ51N

G62L

GZ65N

GZ72N

★

EBZ4800

EB7001

EBZ4800

EBZ3000RH
EBZ3050RH

★: Left hand throttle lever specifications
＊1: EBZ5100Q has low noise specifications.
＊2: Equipped with frame for the mist kit installation.

EBZ5100★
EBZ5100RH
EBZ5100Q★＊1
EBZ5150★
EBZ5150RH
EBZ5150Q★＊1

EB6200
EB7000

EBZ8001＊2

EB7000

EBZ8001＊2
EBZ7100★
EBZ7100RH
EBZ7150★
EBZ7150RH

EBZ8001★
EBZ8001RH
EBZ8050★
EBZ8050RH

Model Notation
The engine type and blower model nomenclature is as follows.
The applicable blower models and series names are indicated at right of the maintenance item
title. Refer to this nomenclature to confirm engine type and blower model.
● Engine Type

G Z 25 N
Engine series (L/ N/ K)
Displacement (cm3)
Strato charged engine (green engine)

● Blower Model

HB Z 26 01
Minor changed code
Handheld Bower

EB Z 71 00
Backpack (shouldering type) Blower

EB Z 51 00 RH
Right hand throttle lever specification

EB Z 51 00 Q
Low noise specifications

EB Z 51 50
Evaporation tank (fluorine coated) specification
(Since January, 2009.)

Contents
1. Special Features ............................................................................................................ 1
2. Specifications and Technical Data
2-1 Blower ........................................................................................................................... 2
2-2 Pipe ............................................................................................................................... 3
2-3 Overall dimensions ........................................................................................................ 4

3. Special Tools
3-1 Rotor Removal .............................................................................................................. 5
3-2 Module Assembly ........................................................................................................ 11
3-3 Recoil Pulley Removal ................................................................................................ 14
3-4 Piston Pin Removal ..................................................................................................... 15

4. Service Guide
4-1 Starter Pulley Removal ............................................................................................... 17
4-2 Air Inlet Net Removal .................................................................................................. 17
4-3 Upper Spring Damper Removal .................................................................................. 18
4-4 Volute Cover Lower Damper Removal ........................................................................ 19
4-5 Flywheel Side Crankshaft Removal ............................................................................ 19
4-6 Crankcase Oil Seal and Bearings Removal ................................................................ 20
4-7 Crankcase Assembling ............................................................................................... 21
4-8 Piston Inserting Direction ............................................................................................ 24
4-9 Piston Pin Snap Ring Assembly

................................................................................ 24

4-10 Positioning of Lead Air Intake Tube .......................................................................... 25
4-11 Reed Valve Assembly ............................................................................................... 25
4-12 Gasket Assembly ...................................................................................................... 26
4-13 Scavenging Duct Cover Assembly ............................................................................ 27
4-14 Muffler Assembly ....................................................................................................... 27
4-15 Switch Cord Assembly .............................................................................................. 28
4-16 Cable Wiring .............................................................................................................. 30
4-17 Fan Assembly ........................................................................................................... 31
4-18 Backpack Pad Air Supply Pipe Assembly ................................................................. 31
4-19 Upper Spring Damper Assembly .............................................................................. 31
4-20 Upper Damper Assembly .......................................................................................... 32
4-21 Lower Damper Assembly .......................................................................................... 32
4-22 Carburetor Assembly ................................................................................................ 33
4-23 Engine Cover Assembly ............................................................................................ 33
4-24 Check of the Gasket Assembly ................................................................................. 34
4-25 Spark Arrester Removal ............................................................................................ 35
4-26 Spark Arrester Cleaning ............................................................................................ 36
4-27 Muffler Cleaning ........................................................................................................ 36
4-28 Air Cleaner Inspection ............................................................................................... 37
4-29 Element Removal ...................................................................................................... 37
4-30 Element Cleaning ...................................................................................................... 39

5. Structure of Right Hand Throttle Lever ............................................................. 40
6. Carburetor
6-1 Specifications .............................................................................................................. 41
6-2 Carburetor Configuration ............................................................................................ 42
6-3 Carburetor Conforms to Exhaust Emissions Regulations .......................................... 43
6-4 Limiter Cap Removal/ Installation ............................................................................... 44
6-5 Idling Speed Adjustment ............................................................................................. 44
6-6 Carburetor Inspection ................................................................................................. 45
6-7 Carburetor Adjustment ................................................................................................ 47

7. Maintenance Standards
7-1 Engine ......................................................................................................................... 51
7-2 Tightening Torques ...................................................................................................... 52

8. Troubleshooting
8-1 Engine does not start .................................................................................................. 53
8-2 Engine stop during operation ...................................................................................... 53
8-3 Engine cannot be stopped .......................................................................................... 53
8-4 Lack of output power or unstable revolution ............................................................... 54
8-5 The amount of the wind is weak ................................................................................. 54

1. Special Features
Pipe End Specifications and Characteristics
Operating area
Pipe End
φ57 mm (2.24 in.)

Pipe End
φ72 mm (2.84 in.)/
φ66 mm (2.60in.)

Engine
The environmental friendly Strato
Charge Engine is installed.

Centrifugal Fan
Open Vane Fan

The exhaust gas toxin concentration is greatly
reduced without need for a catalyst, to generate
reactive heat. High engine cooling performance
promotes stable output even during continuous
operation in summer. Furthermore, low fuel
consumption reduces running costs.
Strato Charged: It means prior air intake and
layered scavenging system.
Strato charged engine installed models:
HBZ2601
EBZ3000
EBZ4800
EBZ5100
EBZ5100Q
EBZ7100
EBZ8001

Closed Vane Fan

The fan is designed to deliver air
efficiently and silently.
Usually an open type fan is used,
whose vanes are bare. Some
fans have closed construction
whose vane edges are joined to a
plate.

Backpack Pad Ventilation
The backpack blower has air ventilation system between the blower's pad
and operator's back to reduce sweating and ensure comfortable operation.

Exhaust Type:

Inhalation Type:

Cools the operator's back by
exhausting air between the blower's
pad and operator's back.

Cools the operator's back by
sucking air between the blower's
pad and operator's back.

Exhaust models:

Inhalation models:

EB4300/ EBZ4800/ EBZ5100 Series
EB6200/ EB7000/ EB7001/ EBZ7100

EBZ3000 EBZ8001

Duckbill Nozzle

Nozzle Shapes of the Pipe End

The closed vane fan will deliver a
larger airflow compared to the
same sized conventional open
vane fan.

Main Purpose

φ72 mm (2.84 in.)/
φ66 mm (2.60in.)

A larger diameter promotes
voluminous air blowing.
It is suitable for blowing
withering fallen leaves, paper
trash and other light material.

φ57 mm (2.24 in.)

A narrower nozzle generates
higher air pressure.
It is suitable for blowing trimmed
turf, pine needles and other
moist or weighty material.

Closed vane fan installed model:
EBZ8001

Fuel/ air mixture
and pure air are
separately induced
during piston

B

Guard Net

Firstly pure air is
inhaled, then fuel/
air mixture is
inhaled.

A pure air layer
forms to push out
the burnt gasses
resulting in a
reduced volume of
unburnt exhaust
gasses.

To prevent leaves, dirt or foreign matter being
drawn in, a net is set between the volute cover
and the frame.
If leaves or dirt block at the net and the air
intake, airflow and blower cooling efficiency will
be reduced resulting in overheating.
Guard net installed models:
EBZ3000
EBZ4800 Frame
EBZ5100
EBZ5100Q
EB7000
EB7001
EBZ7100
EBZ8001

A

Duckbill Nozzle
Dimensions (A x B)
Small nozzle: 23x138 mm (0.91x5.43 in.)
Large nozzle: 30x180 mm (1.18x7.09 in.)

Ventilation

Large Air Cleaner
A large air cleaner, incomparable to other manufacturer's models,
is installed. The large air cleaner consist of two stage filters
(pre-filter and paper filter).
An extended cleaning interval compared to conventional models
ensures easier maintenance and trouble-free operation.
● Air cleaner performance: Twice that of conventional models.
● Cleaning interval: Three times longer than any other
manufacturer's blower of the same class.
Large air cleaner employing models:
EB7000
EB7001
EBZ7100
EBZ8001

Noise Comparison between Models
15 m
(49 ft)

Model

Air Cleaner Cover

Pre-filter
paper Filter
15 m
(49 ft)

Guard Net
Volute Case

A wide nozzle spreads the
blown air.
It is suitable for trimmed turf and
fallen leaves that stick to the
ground.

Air Cleaner Body
Under ANSI B175.2-2000; (8 points measurement)

Noise dB (A)
15 m (49 ft) Noise
level
from the
blower

EBZ4800

67

EBZ5100Q

68

HBZ2601

69

EBZ3000

69

HB2302/ 2311

70

HBZ2601CA

72

EBZ5100

71

EB4300

74

EB6200/ 7000/ 7001

75

EBZ7100

77

EBZ8001

77

Low

High

1

2. Specifications and Technical Data
2-1 Blower
Item
Category
Engine Type

★：Left
hand throttle lever specifications
★：
Unit

Specifications
Handheld Blower
G23L
HB23 Series

Blower Model

Sales Region
(Reference)

G4K
－

GZ48N
－

EBZ3000RH/
EBZ3050RH

EB4300

EBZ4800

EBZ5100/
EBZ5100RH/
EBZ5150/
EBZ5150RH

EBZ5100Q/
EBZ5150Q

EB6200

EB7000

EB7001

EBZ7100/
EBZ7100RH/
EBZ7150/
EBZ7150RH/

JAP, General

JAP, EU, General

USA

USA

General

EU, General

JAP

USA

←
←
←
40 (1.575)
33 (1.299)
41.5

←
←
←
43 (1.693)
←
47.9

←
←
←
44 (1.732)
←
50.2

←
←
←
←
←
←

←
←
←
47.5 (1.870)
35 (1.378)
62

←
←
←
←
←
←

←
←
←
←
←
←

←
←
←
←
36.6 (1.441)
64.9

GZ72N
EBZ80 Series
EBZ8001
EBZ8001/
EBZ8001RH/
EBZ8050/
EBZ8050RH
EU, General
USA
←
←
←
50 (1.969)
←
71.9

HB2311EZ

HBZ2601

HBZ2601

EU, General

JAP

EU, General

USA

←
←
←
←
←
←

←
←
←
34 (1.339)
←
25.4

←
←
←
←
←
←

USA
2
1
←
38 (1.496)
26 (1.024)
29.5

JAP, EU, General

GZ51N
EBZ51 Series

－

G62L
EB70 Series

GZ65N
EBZ71 Series

←

8

7.4

7.4

8.1

8

7.8

7.3

7.7

←

←

7.4

7.5

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←
←
←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

WYJ-374

WYA-26E

WYA-65

WYK-67A

EU：WYA-51B
JAP：WYA-42B

WYA-79

WYA-83

WYK-73A

WYK-123A

←

WYA-81

WYA-44B

Recoil starter

←

USA, EU: WYA-73B
JAP: WYA-82
Recoil starter
(Coil dumper type: EZ)

Recoil starter

←

←

←

←

←

←

←

←

－

Recoil starter

Recoil starter
(Coil dumper type: EZ)

Type

－

Analog controlled
TCI Flywheel
Magneto with
advance-angle

←

Analog controlled
CDI Flywheel
Magneto with
advance-angle

←

←

←

←

Digital controlled
CDI Flywheel
Magneto with
advance-angle

Analog controlled
CDI Flywheel
Magneto with
advance-angle

←

←

←

Digital controlled
CDI Flywheel
Magneto with
advance-angle

←

Model

－

UK-08922-01

←

UK-08922-35

←

USA: UK-08958C-31
JAP, EU: UK-08958-31

ZMG-8

ZMG-10G

UK-08963-54

ZMG-10G

ZMG-8

←

←

ZMG-14CGD

ZMG-14GD

°/ rpm
－

24/ 6000
RCJ6Y
0.6～0.7
(0.024～0.028)
Primary coil
short-circuiting

←
←

35/ 7000
CMR7A

←
CMR7H

37/ 7500
←

28/ 7000
RJ6C

35/ 7000
CMR7H

33/ 7000
←

35/ 7000
←

28/ 7000
BPMR7A

←
←

←
←

34/ 7000
CMR7H

33/ 7000
←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

Toggle type
←
←

No setting
←
←

←
←
←

Push type
No setting
←

←
Slide type
←

←
←
←

←

←

Primary: Dry puff
Secondary: Dry paper

←

←

←
←

Starting Method

Ignition Timing
Type
Spark Plug
Gap
Stopping
Method

GZ30N
EBZ30 Series
EBZ3000

HB2302

Cycle
－
2
1
Number of Cylinders
－
Valve Type
－
Piston valve
mm (in.)
32 (1.260)
Cylinder Bore
Stroke
mm (in.)
28 (1.102)
cm3
22.5
Displacement
Effective
－
7.7
Compression Ratio
Gasoline/oil mixed fuel
Fuel
－
Engine lubrication
－
Fuel-oil mixture
2-cycle oil
Engine lubrication Oil
－
Zenoah FC 40:1
Normal FB 25:1
Mixing Ratio
－
RedMax FD 50:1
Diaphragm type
Type
－
rotary valve
Carburetor
(Walbro)
WYJ-110A
Model
－

Ignition
System

Backpack Blower
GZ25N
HBZ26 Series

Type

LH
RH
Cooling System
Air Cleaner
Element Type
Output Axle Rotation
Direction

mm (in.)
－

Digital control Misfire
for excessive speed
Maximum speed:
85000 rpm

Forced air cooling

←

←

←

No setting
Slide type
←

－

Single layer dry
element

←

←

←

←

－

Counterclockwise

←

←

←

←

←

←

←

←

←

←

←

←

Length mm (in.)

325 (12.8)

←

327 (12.9)

←

313 (12.3)

335 (13.2)

352 (13.9)

401 (15.8)

←

336 (13.2)

←

365 (14.4)

371 (14.6)

Width

mm (in.)

225 (8.86)

233 (9.17)

268 (10.55)

269 (10.59)

394 (15.5)

452 (17.8)

★485 (19.1)

←

←

←

420 (16.5)

476 (18.7)

←

★489 (19.3)
/ 454 (17.9)
←

449 (17.7)

360 (14.2)

★483 (19.0)
/ 441 (17.4)
495 (19.5)

★483 (19.0)

Height mm (in.)

★489 (19.3)
/ 454 (17.9)
495 (19.5)

←

←

★487 (19.2)
/ 467 (18.4)
←

380 (15.0)/
USA: 390 (15.4) Throttle arm
★540 (21.3) Vertical state
/ 490 (19.3)
496 (19.5)

Dry Weight

kg (lbs.)

3.7 (8.16)

←

3.9 (8.6)

4 (8.82)

6.1

8.5

8.9

9.4

←

9.1

9.7

←

10.6

11.7/ USA：11.5 Elbow included,

Fuel Tank Capacity
Idling Speed
Operating Speed
Blower Nozzle
Diameter

L
rpm
rpm

0.75
2300
7500

←
←
←

0.65
2800
7890

←
3000
7600

1.08
3000
6700

1.8
2000
6350

2.1
2200
6000

←
←
5700

2
2000
7700

2.1
←
7300

←
←
←

←
←
7050

2.3
←
6700

mm (in.)

66 (2.60)

←

←

←

←

←

1.9
2300
6250
66 (2.60)
Option: 55 (2.17)

66 (2.60)

←

←

←

←

←

72 (2.835)

m3/ min

10

←

10.4

←

10.6

12

13.2

13.8

12.8

14

15

16.5

16.6

19.4

m/ s

55.4

←

←

←

58.7

66.5

73.1

76.4

70.9

77.5

83.1

91.4

91.9

90.3

Maximum Output

kW/ rpm
(PS)

0.86/ 8000
(1.17)

←
←

0.88/ 7500
(1.2)

0.86/ 7500
(1.17)

0.95/ 7500
(1.29)

1.80/ 8000
(2.45)

1.88/ 8000
(2.56)

1.62/ 7500
(2.2)

1.53/ 7500
(2.08)

2.87/ 7500
(3.9)

3.1/ 7000
(4.1)

3.1/ 7000
(4.1)

2.98/ 8000
(4.05)

3.29/ 8000
(4.48)

Fuel Consumption

L/ h

0.8

←

0.59

0.51

0.59

1.7

1.05

1.1

0.98

1.9

←

←

1.65

1.85

Ambient noise at
15 m from the blower
Noise at operator
(Reference value)
Sound Power Level

dB (A)

70

←

69

72

69

74

67

71

68

75

←

←

77

77

dB (A)

91

←

95

92

91

99

92

94

92

97

99

←

100

100

dB (A)

106

←

106

←

100

106

104

104

102

110

107

←

110

112

Switch

Overall
Dimensions

Average air volume at
aimed blowing point
Maximum air speed at
aimed blowing point
(Calculated estimate)

－
－
－

Push type

Push type
No setting
Push type
←
←
←
←
←
←
Single layer
Dual layer
Single layer
half-wet element half-wet element half-wet element

Remarks

View from output
axle

Blower pipe excluded

Under actual blower
state

ANSI B175.2-2000

ISO 11094

2

2. Specifications and Technical Data
2-2 Pipe

Unit: mm (in.)

Part Name

Grip Assembly

Vacuum Kit

Pipe End

φ66
(2.60)
Form

Straight Pipe＋
＋Duckbill Nozzle

φ57
(2.24)

φ72
(2.84)

Diameter: D
φ66
(2.60)

138 (5.43)

180 (7.19)
30 (1.18)

23 (0.91)
Standard
RedMax Lodo
Solid Color
EB430/
EBE440
HB2302/
HB2311EZ/
HBZ2601
EBZ3000
EB4300/
EB6200/
Model
EB7000
EBZ4800
EBZ5100Q
EBZ5100/
EB7001
EBZ7100
EBZ8001

Part
Number

D=φ60 (2.36)

D=φ74 (2.91)

D=φ80 (3.15)

3495-51400
(Option)

2750-51501
(Standard)

848-L58-6521
(Standard)

φ73 (2.87)×φ66 (2.60)
6811-51220 (Standard)
848-L0L-65E0 (Standard)

(Option)

φ73 (2.87)×φ57 (2.24)
2756-51220 (Option)
848-L38-65E0 (Option)

φ79 (3.11)×φ66 (2.60)
848-L5C-65E1 (Standard)
848-L5K-65E1 (Standard)

φ79 (3.11)×φ72 (2.84)
848-L58-65E1 (Standard)
848-L5Z-65E0 (Standard)

Forφ73 (2.87)

Forφ79 (3.11)

6811-51211+6811-51230
(Option)

848-L58-65D0+848-L58-65L0
(Option)

●
+(2750-51200 Swivel Joint)

●
-

-

-

-

-

-

●

● (Option)

●

●

● (Option)

●

●

●

● (Option)

●

●
●

●
●

● (Standard)
● (Option)

●
●

●

●

● (Option)

●

●

● (Standard)
● (Option)

●
●

Part Name

Flexible Pipe

Swivel Joint

D1

Straight Pipe

● (Option)
● (Standard)
Silencer

D1

D1

●
●
Pipe End

D1

D1

Form
D

Standard
Part
Number

Model

Diameter: D
Diameter: D1
Length: L
RedMax Lodo
Solid Color
EB430/
EBE440
HB2302/
HB2311EZ/
HBZ2601
EBZ3000
EB4300/
EB6200/
EB7000
EBZ4800
EBZ5100Q
EBZ5100/
EB7001
EBZ7100
EBZ8001

L

D

L

L

D

φ87 (3.43)
φ70 (2.76)
420 (16.54)

φ87 (3.43)
φ70 (2.76)
372 (14.65)

φ94 (3.70)
φ70 (2.76)
345 (13.58)

φ99.5 (3.92)
φ80.5 (3.17)
345 (13.58)

φ70 (2.76)
φ60 (2.36)
370 (14.57)

φ70 (2.76)
φ74 (2.91)
340 (13.39)

φ80 (3.15)
φ79 (3.11)
365 (14.37)

φ61 (2.40)
φ60 (2.36)
370 (14.54)

φ74 (2.91)
φ73 (2.87)
320 (12.60)

φ80 (3.15)
φ79 (3.11)
365 (14.37)

φ74 (2.91)
φ73 (2.87)
346 (13.62)

3495-51110

T4017-51110

T4030-51110

848-L65-65A0

3495-51202

2750-51201

848-L58-6511

3495-51321

6811-51211

848-L58-65D0

T4030-51110

●
-

●
-

-

-

-

-

●
-

-

φ61 (2.40)
φ57 (2.24)
355 (13.98)
3495-51300

φ73 (2.84)
φ66 (2.60)
340 (13.39)
6811-51220
848-L0L-65E0

●

-

●

●

●

-

●

●

●

●

-

●

●
●

●
●

-

●

●

●
●

●

●
●
●

-

-

-

●
●
●

●
●

-

φ73 (2.87)
φ57 (2.24)
340 (13.39)
2756-51220
848-L38-65E0

φ79 (3.11)
φ79 (3.11)
φ66 (2.60)
φ72 (2.84)
340 (13.39)
340 (13.39)
848-L5C-65E1 848-L58-65E1
848-L5K-65E1 848-L5Z-65E0

●

●

●

L

D

L

D

●

●
●

3

2. Specifications and Technical Data
2-3 Overall dimensions
Handheld Blower

Blower Type
HB2302
HB2311EZ
HBZ2601
HBZ2601 (USA)

A
325 (12.8)
325 (12.8)
327 (12.9)

B
225 (8.86)
233 (9.17)
268 (10.55)
269 (10.59)

C
360 (14.2)
360 (14.2)
360 (14.2)

Unit: mm (in.)
D
610 (24.0)
610 (24.0)
610 (24.0)

Backpack Blower
Blower Type

A
313
EBZ3000/ 3000RH/ 3050/ 3050RH
(12.3)
335
EB4300
(13.2)
352
EBZ4800
(13.9)
401
EBZ5100/ 5100RH/ 5150/ 5150RH
(15.8)
401
EBZ5100Q/ 5150Q
(15.8)
336
EB6200
(13.2)
336
EB7000
(13.2)
365
EB7001
(14.4)
371
EBZ7100/ 7100RH/ 7150/ 7150RH
(14.6)
380
EBZ8001
(15.0)
EBZ8001/ 8001RH/ 8050/ 8050RH:
390
USA
(15.4)
RH: Right

485
(19.1)
487
(19.2)

467
(18.4)

Unit: mm (in.)
C
D
420
1222
(16.5) (48.11)
495
1222
(19.5) (48.11)
476
1248
(18.7) (49.13)
495
1195
(19.5) (47.05)
495
1221
(19.5) (48.07)
495
1222
(19.5) (48.11)
495
1222
(19.5) (48.11)
495
1195
(19.5) (47.05)
495
1185
(19.5) (46.65)

540
(21.3)

490
(19.3)

496
(19.5)

B
―
489
(19.3)
―
483
(19.0)
483
(19.0)
489
(19.3)
―

BB
394
(15.5)
454
(17.9)
452
(17.8)
441
(17.4)
―
454
(17.9)
449
(17.7)
―

1185
(46.65)

hand throttle lever specification

4

3. Special Tools
3-1 Rotor Removal
Description
Part Name
Part Number

Stopper
2670-96220

Stopper
Stopper
Puller Assy Puller Assy Puller Assy
3350-96220 4810-96220 2890-96100 1490-96101 2750-96100

Wrench (TORX)
2850-96410
Size: T20/ T25/ T27

1664-96410
Model
HB23 Series

●

●

HBZ26 Series

●

EBZ30 Series

●

EB4300/ 6200
EB70 Series

Wrench (HEX)
3304-97611
Size: 3/4/5 mm

●
●

●

EBZ4800
EB51/ 71/ 80 Series

●

●

●
●

●

●

●

Remove the rotor using the puller assy (special tool) while preventing piston movement by setting the stopper
(special tool).
Examples of special tool usage and maintenance procedures categorized by type and series are explained
below. Each drawing includes information on parts such as mount screws and disassembly cautions.

How to use (Procedure)
Construction

Handheld Blower: HB23 Series, HBZ26 Series
Mounting Screw (5)
【HB23 Series】
】:
(+): P5×L20
【HBZ26 Series】
】:
TORX (T27): P5×L20

Mounting Screw (7)
TORX (T27): P5×L20
Engine Cover

Engine Short Block

【HBZ26 Series】
】

Mounting Screw (2)
TORX (T27): M5×L16
＊Installing with the recoil starter.
Mounting Screw (7)
(+): P5×L20
Volute Cover Assy.

Engine Cover
【HB23 Series】
】

Volute Case
Mounting Screw (1)
(+): M4×L14 (PW)
【Disassembly Flowchart】
】
Volute Cover Assy.
↓
Engine Cover
↓
Below the procedure

5

1. Remove the plug, and detach the main complete
parts. Remove the carburetor, recoil starter and
fuel tank if necessary.

3. SPECIAL TOOLS
Handheld Blower: HB23 Series, HBZ26 Series

【HB23 Series】
】

【HBZ26 Series】
】

Stopper

2. Set the stopper (special tool) into the plug hole.

Stopper

Fan

3. Remove the mounting nut using the box wrench
then remove the fan.

Washer

4. Remove the extension using the wrench.

Washer
Mounting Nut
(12 mm Hex)

Wrench (17 mm)
Box Wrench
(12 mm)

Extension

5. Remove the four mounting screws, separate the
volute case and the engine short block.

Mounting Screw
【HB23 Series】
】:
(+): M5×L14 (PW, SW)
【HBZ26 Series】
】:
TORX (T27): M5×L14

Engine Short Block

Volute Case

6

3. Special Tools
Handheld Blower: HB23 Series, HBZ26 Series

Puller Bolt (8 mm)

17 mm
Puller Assy

6. Remove the rotor using the puller assy.
Apply 8 mm puller bolts.

Rotor

How to use (Procedure)

Backpack Blower: EBZ30 Series

Construction
Refer to
“4-3 Upper Spring Damper Removal”

Clip (4)
Air Inlet Net

Refer to
“4-2 Air Inlet Net Removal”

Mounting Screw (8)
TORX (T27): M5×L25
Mounting Screw (3)

Mounting Screw (2)
TORX (T27/ P): M5×L70

Plate

Volute Cover Assy.
Engine Short Block
Mounting Nut (2)
M5
Mounting Screw (3)
TORX (T27): M5×25

Lower Damper

Frame

Volute Case

Mounting Nut (2)
M6

Refer to
“4-4 Volute Cover Lower Damper Removal”

【Disassembly Flowchart】
】
Air Inlet Net
↓
Spring Damper
↓
Frame
↓
Volute Cover Assy
↓
Engine Cover
↓
Below the procedure

7

Engine Cover

Mounting Bolt (1)
(+): M5×L16

1. Remove the plug, and detach the main complete
parts. Remove the carburetor, recoil starter and
fuel tank if necessary.

3. SPECIAL TOOLS
Backpack Blower: EBZ30 Series

2. Set the stopper (special tool) into the plug hole.
Stopper

3. Remove the four mounting screws, then remove
the fan.

Fan
Mounting Bolt
TORX (T27): M6×L30

Mounting Bolt
TORX (T27):
M5×L20

4. Remove the four mounting screws, separate the
volute case and the engine short block.

Volute Case
Engine Short Block

8

3. Special Tools
Backpack Blower: EBZ30 Series

5. Remove the mounting nut using the box wrench.

Box Wrench
(12 mm)

6. Remove the rotor using the puller assy.
Apply 8 mm puller bolts.

Mounting Nut
(12 mm Hex)

Puller Assy.

Puller Bolt (8 mm)

Rotor

How to use (Procedure)
Construction

Backpack Blower: EB4300/ 6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series

Refer to
“4-20 Upper Damper Assembly”

Refer to
“4-2 Air Inlet Net Removal”
Clip (4)

Exceptions for
EB4300/ 6200

Upper Dumper
Air Inlet Net

Mounting Screw (1)

Volute Cover Assy.
Volute Case

Mounting Screw (4)

Engine Cover
Frame
Mounting Nut (2)
M6
Refer to
“4-4 Volute Cover Lower Damper Removal”
【Disassembly Flowchart】
】
Air Inlet Net
↓
Frame
↓
Engine Cover
↓
Below the procedure

9

Lower Damper

Engine Short Block

1. Remove the plug, and detach the main complete
parts. Remove the carburetor, recoil starter and
fuel tank if necessary.

3. SPECIAL TOOLS
Backpack Blower: EB4300/ 6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series

2. Set the stopper (special tool) into the plug hole.
Stopper

3. Remove the four mount screws, then remove the
fan. The fan is detached but stays inside the volute
cover assembly and the volute case.

Mounting
Bolt

Fan

Volute
Case

Volute Cover Assy.

Engine Short Block

4. Remove the six mounting screws then remove the
engine short block from the volute case.

Mounting Bolt

Volute Case

5. Remove the mounting nut using the box wrench.
6. Remove the rotor using the puller assy.
Puller Assy.

Box Wrench
(12 mm)
Mounting Nut
(12 mm Hex)

Rotor

10

3. Special Tools
3-2 Module Assembly
Description
Part Name
Part Number

Gauge
3350-96240
T=0.4 mm

Gauge
2750-96240
t=0.3 mm

Gauge
848-8W4-0050
t=0.4 mm

Wrench (HEX) 3304-97611
Size: 3/ 4/ 5 mm

Wrench (TORX) 2850-96410
Size: T20/ T25/ T27

Model
HB23 Series
HBZ26 Series
EBZ30 Series

●

●

EB4300/ 6200
EB70 Series
EBZ4800/ 5100Q

●

●

EBZ5100
EBZ71/ 80 Series

●

●

Adjust the air gap between the rotor's magnetic steel and the module using the gauge (special tool).
Module Resistance
Model
HB2302/ 2311EZ

Engine Type
G23L

Air Gap
mm (in.)

Primary Side
(Iron Core ⇒Primary Lead)

Secondary Side
(Iron Core ⇒High Tension Lead)

0.8 kΩ

4.23 kΩ

0.3～0.4 (0.012～0.016)

HBZ2601

GZ25N

＋Side 8.45 kΩ －Side 2.70 kΩ

2.92 kΩ

0.3～0.4 (0.012～0.016)

EBZ3000

GZ30N

＋Side 30.3 kΩ －Side 37.2 kΩ

2.04 kΩ

0.3～0.4 (0.012～0.016)

EBZ3000RH/ 3050RH

GZ30N （USA） ＋Side 31.6 kΩ －Side 37.4 kΩ

2.05 kΩ

0.3～0.4 (0.012～0.016)

EB4300

G4K

0.17 kΩ

1.4 kΩ

0.3～0.4 (0.012～0.016)

EBZ4800

GZ48N

EBZ5100Q/ 5150Q

GZ51N

0.33 kΩ

2.77 kΩ

0.3～0.4 (0.012～0.016)

EBZ5100/ 5100RH
EBZ5150/ 5150RH

GZ51N

＋Side 71.2 kΩ
－Side: cannot be measured

11.0 kΩ

0.35～0.45 (0.014～0.018)

EB6200/ 7000/ 7001

G62L

0.17 kΩ

1.4 kΩ

0.3～0.4 (0.012～0.016)

EBZ7100/ 7100RH
EBZ7150/ 7150RH

GZ65N

Several MΩ or higher

2.74 kΩ

0.35～0.45 (0.014～0.018)

EBZ8001/ 8001RH
EBZ8050/ 8050RH

GZ72N

Several MΩ or higher

2.72 kΩ

0.35～0.45 (0.014～0.018)

REFERENCE
The resistance values shown above are the
reference values for resistance tester
measurement. The resistance value is within
the normal range shows no internal leakage
or any other defect.
We supply the measurement equipment (gap
tester) that can measure spark energy while
the engine is running.
3699-90247
Three-point gap tester
* Connect Negative Side (black) to Iron Core.

11

3. SPECIAL TOOLS
Examples of the gauge (special tool) usages are shown according to the type of the gauge.

Gauge: 3350-96240 (T=0.4 mm)

HB23 Series, HBZ26 Series, EBZ30 Series

【HB23 Series】
】
Wrench

Rotor

1. Remove the obstructive parts in order to see the
rotor and the module.
(Refer to “3-1 Rotor Removal”.)
2. Insert a gauge (special tool) between the rotor
magnet metal and module. Tighten the mounting
bolts while pushing the module against the rotor.

Gauge

Mounting Bolt
Module

【HBZ26 Series】
】
Rotor

Wrench

Module

Mounting Bolt
Gauge

【EBZ30 Series】
】
Wrench
Rotor

Mounting Bolt

Gauge

Module

12

3. Special Tools
Gauge: 2750-96240 (T=0.3 mm)

EB4300/ 6200, EB70 Series, EBZ4800/ 5100Q
1. Remove the module cover.

【EB4300/ 6200, EB70 Series】
】
Gauge

2. Insert a gauge (special tool) between the rotor
magnet metal and module. Tighten the mounting
bolts while pushing the module against the rotor.

Wrench

Rotor

Mounting Bolt

【EBZ4800/ 5100Q】
】
Module

Wrench

Gauge
Rotor

Module

Mounting Bolt

Gauge: 848-8W4-0050 (T=0.4 mm)

EBZ5100, EBZ71/ 80 Series
1. Remove the module cover.

【EBZ5100】
】
Rotor

2. Insert a gauge (special tool) between the rotor
magnet metal and module. Tighten the mounting
bolts while pushing the module against the rotor.

Wrench

Gauge

Mounting Bolt

【EBZ71/ 80 Series】
】
Rotor

Module

Wrench

Gauge

Module

13

Mounting Bolt

3. SPECIAL TOOLS
3-3 Recoil Pulley Removal
Description
Part Name
Part Number

Stopper
4810-96220

Puller
4500-96100

Puller
848-8W0-0020

Wrench (HEX) 3304-97611
Size: 3/ 4/ 5 mm

Wrench (TORX) 2850-96410
Size: T20/ T25/ T27

Model
HBZ26 Series

●

EBZ71/ 80 Series

●

●

●
●

●

Remove the recoil pulley using the puller (special tool) while preventing piston movement by setting the
stopper (special tool).
Examples of the puller (special tool) usages are shown according to the type of the puller.

Puller: 4500-96100

HBZ26 Series
Box Wrench

1. Remove the recoil starter and the spark plug.
2. Insert the stopper (special tool) to the plug hole
(Refer to “3-1 Rotor Removal”).
3. Engage the puller (special tool) to 2 holes on the
pulley and pull out the pulley.

Puller

Note: Pulley screw is right turn screw.

Pin
Hole

Pulley

Puller: 848-8W0-0020
Box Wrench

EBZ71/ 80 Series
Pin

Puller

1. Remove the recoil starter and the spark plug.
2. Insert the stopper (special tool) to the plug hole
(Refer to “3-1 Rotor Removal”).
3. Extract the pulley while holding the pulley by the
puller's pins (special tool).
Note: Pulley screw is right turn screw.

Pin

Pulley
Pin

Pin

Puller

Pulley

14

3. Special Tools
3-4 Piston Pin Removal
Description
Part Name
Part Number

Rod Assy
1101-96220
φ7.5×φ4.7

Rod Assy
3350-96230
φ11×φ8

Rod Assy
2750-96230
φ11×35 mm

Wrench (HEX) 3304-97611
Size: 3/ 4/ 5 mm

Wrench (TORX) 2850-96410
Size: T20/ T25/ T27

Model
HB23 Series
HBZ26 Series

●

●

EBZ30 Series
EB4300

●

EB6200
EB70 Series

●
●

EBZ4800
EBZ51 Series

●

EBZ71/ 80 Series

●
●

●(Only a rod is used.)

●

Remove the cylinder, and then the piston pin using the rod assy (special tool).
Examples of the rod assy (special tool) usages are shown according to the type of the rod assy.

Rod Assy: 1101-96220

HB23 Series, HBZ26 Series
1. Remove the engine short block (refer to “3-1 Rotor
Removal”) and then remove the cylinder.

Plastic Hammer

2. Remove the snap rings from both sides of the
piston pin.

Rod Assy.
Piston

3. Engage the rod assy (special tool) against the
piston pin and gently tap with a plastic hammer to
push out the pin.

CAUTION
Hard hammering may damage the big end of
the connecting rod.

REFERENCE

Piston

EBZ71/ 80 Series are designed so that the
piston assembly can be disassembled
without any tool. However, if it is difficult to
pull out the piston pin, use the special tool
(Rod Assy: 1101-96220) to push out the
piston pin.

Rod

Piston Pin

15

3. SPECIAL TOOLS
Rod Assy: 3350-96230

EBZ30 Series, EB4300, EBZ4800, EBZ51 Series
1. Remove the engine short block (refer to “3-1 Rotor
Removal”) and then remove the cylinder.

Piston

Rod assy.

Piston Pin

2. Remove the snap rings from both sides of the
piston pin.
3. Insertion the rod assy (special tool) against the
piston pin and gently tap with a plastic hammer to
push out the pin.

CAUTION
Hard hammering may damage the big end of
the connecting rod.

Rod Assy: 2750-96230
Piston Pin

EB6200, EB70 Series
Snap Ring
(Remove)

1. Remove the engine short block (refer to “3-1 Rotor
Removal”) and then remove the cylinder.
2. Remove the snap ring from starter side of the
piston pin.
3. Rest the rod assembly against the end of the piston
pin and pull the piston pin out from the piston.

Rod Assy.

Piston

Snap Ring
(Don’t remove)
Piston Pin

Rod Assy.

Snap Ring

16

4. Service Guide
4-1 Starter Pulley Removal
HB23 Series, EBZ30 Series
● Insert the stopper (special tool) into the plug hole
(refer to “3 Special Tool”) to secure the piston.

Pliers

● Remove the starter pulley using commercially
available pliers. The pulley must be covered with
cloth to prevent from damage.

CAUTION
Never remove the starter pulley by hitting
with a hammer.
Doing so may damage the pulley.

Starter Pulley
Cloth

EB4300/ 6200, EB70 Series, EBZ4800, EBZ51 Series
Box Wrench
Puller

● Insert the stopper (special tool) into the plug hole
(refer to “3 Special Tool”) to secure the piston.
● Remove nut (M10), set a commercially available
puller, then remove the starter pulley.

CAUTION

Nut (M10)

Never remove the starter pulley by hitting
with a hammer.
Doing so may damage the pulley.

Starter Pulley

Starter Pulley

4-2 Air Inlet Net Removal
EB6200, EB70 Series, EBZ4800, EBZ30/ 51/ 71/ 80 Series
The air inlet net is mounted by four clips.
The removal procedure is shown below.

【Clip Position】
】
Air Inlet Net

1. Loosen each clip’s resin screw and remove the
whole.

CAUTION
Set the Philips screwdriver against the resin
screw securely. Insufficient or excessive
contact may cause the resin head to break.

Clip
Screwdriver

2. Insert a screwdriver between free flow net and
frame, then wrench the clip open by twisting the
screwdriver.

CAUTION
Pay attention not to damage the air inlet net
or frame with the screwdriver.
Resin Screw

17

4. Service Guide
4-3 Upper Spring Damper Removal
EBZ30 Series
To remove the upper spring damper, follow the
procedure below.
1. Remove the three mounting screws.
Plate

2. Pull the plate upward from the spring holder’s
groove.

Mounting Screw
TORX (T27): M5×L25

Spring Holder

3. Press the upper part of the volute to the frame to
slacken the strap, and then pull out the plate.

Strap

Plate

4. Pull the strap out from the volute case.

Screwdriver

5. Remove the spring from the volute case, then the
spring holder. The spring is easily removed by
pressing and turning the tip of the spring along the
spring groove with a screwdriver.
Spring

Spring Holder
Volute Case
Strap
Spring

Screwdriver

18

4. Service Guide
4-4 Volute Cover Lower Damper Removal
EB6200, EB70 Series, EBZ4800, EBZ30/ 51/ 71 Series
Volute Cover Mounting Screw

● Remove the volute unit from the frame.
● Remove the all mount mounting screws, separate
volute cover from its case, then remove the lower
damper unit.

Volute Case
Lower Damper

EBZ80 Series
Cover
Mounting Screw

● Remove the volute unit from the frame.
● Remove the cover by removing the three mounting
screws then remove the lower damper from the
volute case’s groove.

Volute Unit
Lower Damper

4-5 Flywheel Side Crankshaft Removal
EBZ4800, EBZ30/ 51/ 71/ 80 Series
● Be sure to extract the key beforehand.
● The precision fit between crankshaft and main
bearings is very tight. Be sure to use the press to
remove the crankshaft.

CAUTION
Press

Guide
Key
Crankshaft

Never hit the crankshaft to remove it.
The crankshaft’s threading may be lost or the
shaft axis may deform.
● Secure the crankcase on support and then press
the crankshaft with the press via the guide.

CAUTION
Never press the crankshaft directly with the
press.
Doing so may damage the shaft’s threading.

Support

19

4. Service Guide
4-6 Crankcase Oil Seal and Bearings Removal
All Models
【Fan Side】
】

Press

Bearing Guide

● Disassembly is usually unnecessary. However, if
the oil seal’s main lip or dust lip is worn, the shaft
will become loose due to bearing wear or if the they
have seized, replace the oil seal and bearings with
new ones.
● Be sure to use the press to remove the bearings.

CAUTION
Be sure to use the press to press the
bearings out during bearing removal. Without
jig use to the crankcase may be damaged.

Crankcase

● If the crankcase’s bearings are worn, replace them
with new ones.
Bearing

Support
【Starter Side】
】

Press

Bearing Guide

Crankcase

Bearing

Support

20

4. Service Guide
4-7 Crankcase Assembling
Bearings, snap ring, oil seal configuration and installation position differ depending on type.
Properly install each part and reassemble the crankcase referring to the corresponding type’s drawing.
For bearing and oil seal installation, refer to the explanation on page 23.

HB23 Series, HBZ26 Series
Construction
Snap Ring

Bearing
Push the bearings until they
contact the crankcase.

【Starter Side】
】
Oil Seal

【Fan Side】
】

Oil Seal
Align the oil seal surface with
the crankcase surface.
Bearing
Push the bearings until they
contact the snap ring.

Crank Case

Push the oil seal within 0 to
0.5 mm (0.02 in.) from the
crankcase surface.

EBZ30 Series
Construction

Lubrication Hole

Lubrication Hole
Bearing
Push the bearings until they
contact the crankcase.

Snap Ring
Do not cover the lubrication
hole with the snap ring.
【Fan Side】
】
Oil Seal

【Starter Side】
】
Oil Seal

Snap Ring

Push the oil seal within 3.3
to 3.8 mm (0.13 to 0.15 in.)
from the crankcase surface.

Bearing
Push the bearings until they
contact the snap ring.

Crank Case

Push the oil seal within 0 to
0.5 mm (0.02 in.) from the
crankcase surface.

EB4300
Construction
Snap Ring
Bearing
Push the bearings until they
contact the crankcase.
【Fan Side】
】

【Starter Side】
】

Oil Seal

Push the oil seal until
its surface comes trim
with the crankcase
edge surface.

21

Oil Seal

Bearing
Push the bearings until they
contact the snap ring.

Crank Case

Push the oil seal
until its surface
comes trim with
the crankcase
edge surface.

4. Service Guide
EBZ4800, EBZ51 Series
Construction

Lubrication Hole

Lubrication Hole
Bearing
Push the bearings until they
contact the crankcase.

Snap Ring
Do not cover the
lubrication hole with the
snap ring.

【Starter Side】
】

【Fan Side】
】
Oil Seal

Oil Seal
Push the oil seal
within 1.5 to 2.3 mm
(0.06 to 0.09 in.)
from the crankcase
surface.

Bearing
Push the bearings until they
contact the snap ring.

Push the oil
seal within 0 to
0.5 mm (0.02
in.) from the
crankcase
surface.

Crank Case

EB6200, EB70 Series, EBZ71/ 80 Series
Construction

Lubrication Hole

Lubrication Hole

Snap Ring
Do not cover the
lubrication hole with the
snap ring.

Bearing
Push the bearings until they
contact the crankcase.
【Starter Side】
】

【Fan Side】
】
Oil Seal
Push the oil seal
within 5.3 to 5.7
mm (0.21 to 0.22
in.) from the
crankcase
surface.

Oil Seal
Snap Ring
Bearing
Push the bearings until they
contact the snap ring.

Snap Ring Assembly

Crank Case

Push the oil seal
within 1.3 to 1.7
mm (0.05 to
0.07 in.) from
the crankcase
surface.

EB6200, EB70 Series, EBZ4800, EBZ30/ 51/ 71/ 80 Series
Lubrication Hole
【piston Side】
】

A lubrication hole exists to increase lubrication to the
main bearing. Do not cover the hole with the snap ring.
Set the snap ring’s gap to the piston side.

Snap Ring

22

4. Service Guide
Oil Seal Assembly

All Models
● Never insert the oil seal obliquely. The oil seal may
be fall out.

Press

● Before the oil seal is pressure-inserted, apply
grease to the oil seal.
【Crankcase Outside】
】

● Press the oil seal from the outside of the crankcase
using combined special tools (holder and guide).
● Pay attention because oil seal pressure-insertion
position differs according to rotor, starter and
engine type.
For the insertion position of particular models, refer
to “4-7 Crankcase Assembly”.

Oil Seal
Support

Bearing Assembly

All Models
● Never insert the oil seal obliquely. Press it securely
until it contacts the snap ring.

Press

● Before the bearing is pressure-inserted, apply
grease to the bearing.
● Face the bearing identification mark (mark is
recessed) toward the inside of the crankcase and
then insert it.

【Crankcase Inside】
】

● Press the bearings from the outside of the
crankcase using combined special tools (holder
and guide).

Ball Bearing
Snap Ring
Support

Crankcase Assembly
Press

EB6200, EB70 Series, EBZ4800, EBZ30/ 51/ 71/ 80 Series
● The precision fit between crankshaft and main
bearing is very tight. Be sure to use an insertion jig
to remove the crankshaft.

CAUTION
Guide

Never hit the crankshaft by hammer or
equivalent. The shaft’s threading may be lost
or the shaft axis may deform.

Crankshaft

● Secure the crankcase on support and then press
the crankshaft with the press via the guide.

CAUTION
Never press the crankshaft directly with the
press.
Doing so may damage the shaft’s threading.

23

4. Service Guide
4-8 Piston Inserting Direction
All Models
Triangle Mark

Arrow Mark

Make sure to point the recessed mark (arrow or
triangle) on the piston head to the exhaust (muffler)
side.

【Exhaust Side】
】
【Exhaust Side】
】

4-9 Piston Pin Snap Ring Assembly
End Gap Position

HB23 Series, HBZ26 Series, EB4300/ 6200, EB70 Series
Fit the snap ring in the piston’s groove firmly and position
the end gap of the snap ring below the piston.

Notch

CAUTION
・ If the snap ring is poorly inserted or the end
gap of the snap ring is incorrectly
positioned, the snap ring may comes off
during engine operation resulting in
damage to the engine.

Snap Ring

・ Never reuse a snap ring. Always insert a
new one.

End Gap

End Gap Position

EBZ4800, EBZ30/ 51/ 71/ 80 Series
Fit the snap ring in the groove firmly and position the end
gap of the snap ring opposite the notch.

CAUTION
End Gap

・ If the snap ring is poorly inserted or the end
gap of the snap ring is incorrectly
positioned, the snap ring may comes off
during engine operation resulting in
damage to the engine.

Snap Ring

・ Never reuse a snap ring. Always insert a
new one.

Notch

Check After Installation
Snap Ring

All Models
Groove
Piston Pin

After the snap ring is installed, check that it fits firmly
in the correct direction.

REFERENCE
Turn the snap ring using thin tipped tool and
check that it moves smoothly in its groove.
If the snap ring is improperly installed, it will
not move smoothly in its groove.
Snap Ring

24

4. Service Guide
4-10 Positioning of Lead Air Intake Tube
HBZ26 Series
The lead air intake tube has cast marking of either “F”
or “S”.
“S” is for the starter end, and “F” for the fan end.
Assembling position shall not be mixed up.

Marks

CAUTION
Caution: Oppositely assembled tubes will
cause a sealing failure. Before assembling
the tubes, check for deterioration or cracks
and change will new ones if necessary.

Lead Air Intake Tube

4-11 Reed Valve Assembly
HBZ26 Series
Valve Case

Valve Case

Max. 0.2 mm
(0.008 in.)

Reed Valve

Stopper

● Check that there is no foreign matter inside the
valve case.

IMPORTANT
Check the gap between the valve case and
the reed valve.
Replace with new valve if the gap is larger
than 0.2 mm (0.008 in.), or the valve is
distorted.
● Screw lock agent shall be applied to the reed valve
and the stopper fixing screw.

Reed Valve and Mounting Screw

● The reed valve case has a marking either “S” or
“F”.
“S” is for the starter side, and “F” for the fan side.
Assembling position shall not be mixed up.

【Starter Side】
】

25

“S” Mark
Valve Case

“F” Mark
Valve Case

【Fan Side】
】

4. Service Guide
4-12 Gasket Assembly
All Models
Gasket Positions

C, Muffler Gasket

【Fan Side】
】

Each gasket has its installing direction. Pay attention
to the direction when the gasket is being installed.

CAUTION
When the engine is overhauled, replace the
gaskets with new ones.

【Starter Side】
】

A,
Insulator
Gasket

B, Base Gasket

Model

Gasket Positions

Model

Gasket Positions
C

C
EBZ4800
EBZ51 Series

HB23 Series
B

B

A

A
C

C

EB6200
EB70 Series

HBZ26 Series

B

B

Aluminum
Gasket

A

A
C

C
EBZ71 Series
EBZ80 Series

EBZ30 Series

A

B

B
A
C

EB4300
A
B

26

4. Service Guide
4-13 Scavenging Duct Cover Assembly
EBZ30/ 71/ 80 Series
Gasket

The scavenging duct covers have marking either “S”
for starter side or and “F” for fan side.
They must not be oppositely assembled.

CAUTION
When the engine is overhauled, be sure to
replace the gaskets with new ones.

Gasket

“F” Scavenging Duct Cover

“S” Scavenging Duct Cover

REFERENCE
EBZ4800, EBZ51 Series Strato Charged
engines have no scavenging duct covers.

【Fan Side】
】

【Starter Side】
】

4-14 Muffler Assembly
EB4300/ 6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series
Tighten the three muffler mounting bolts to the same
pressure.

CAUTION

Mounting Bolts (long)

・ After the engine is reassembled, run it at full
throttle for more than one minute, then
tighten the muffler mount bolts again.
Torque: 8～
～12N・
・m (80～
～120kgf・
・cm)

Muffler

Mounting Bolts (short)

Bracket

27

・ The bracket may be damaged if the two
muffler mounting bolts (long) on the upper
side are securely tightened before the
mounting bolt (short) on the lower side, is
tightened.

4. Service Guide
4-15 Switch Cord Assembly
Switch Cord Assembly

HB23 Series, HBZ26 Series
● Fit the switch cord connector firmly to the module’s
terminal.

【HB23 Series】
】

Switch Cord

Module
Connector
【HBZ26 Series】
】

Switch Cord

● Secure the switch cord terminal with the module
mounting bolt.

Module

Connector

Terminal

Switch Cord Assembly
About 45 Degrees

EBZ30 Series
Switch Cord
Terminal
Connector

● Secure the switch cord terminal (black) with the
module mount bolt. Tilt the terminal about 45
degrees rightward.

CAUTION
Ensure the cord is not bent nor interfering
with the crankcase.
● Fit the switch cord connector (red) firmly to the
module’s terminal.

Module

28

4. Service Guide
Switch Cord Assembly

EB4300/ 6200, EB70 Series
● Secure the switch cord terminal with the module
mounting bolt.

Module

CAUTION
Ensure the cord is not bent nor interfering
with the crankcase when the module mount
bolt is tightened.
● Bends the terminal of the module, fit the switch
cord connector firmly to the module’s terminal.

CAUTION
Bend the module’s terminal until the cord is
clear of the crankcase.
Switch Cord
Connector
Module’s terminal

Terminal

Switch Cord Assembly
【EBZ5100】
】

EBZ4800, EBZ51/ 71/ 80 Series
● Secure the switch cord terminal with the module
mounting bolt.

Module
Terminal

CAUTION
Bring the terminal into contact with the
crankcase’s protrusion then tighten it.

Contact

● Fit the switch cord connector firmly to the module’s
terminal.
Switch Cord

Connector

Connector
Crankcase’s
protrusion
Terminal
Switch Cord

【EBZ4800, EBZ5100Q, EBZ71/ 80 Series】
】

29

Module

4. Service Guide
4-16 Cable Wiring
Switch Cord Wiring

HB23 Series, HBZ26 Series
● Insert the grommet to align with the volute case
notch and clamp the cord between the protrusions
as shown in the figure at left.

Cords
Grommet

CAUTION
Check that the cord on the module side is not
caught between volute case and crankcase.
● Pay attention that the cord is not caught against the
engine cover when it is installed.

Switch Cord Wiring

EBZ30 Series
● Align the cord along the guide, and insert the
grommet to align with the volute case notch.

Cord
Grommet

CAUTION
Check that the cord on the module side is not
caught between volute case and crankcase.

Cords

● Set the lead cords and clamp them as shown in the
figure at left.

CAUTION
Align the cord not to interfere with the clamp
mounting screw.
● Pay attention that the cord is not caught against the
engine cover when it is installed.
Clamp

High Tension Cord Wiring

EB4300/ 6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series
Insert the grommet to align with the crankcase's notch
and align the high tension cord and secure it with the
clamp as shown in the figure at left.

Clamp

CAUTION
Align the high tension cord not to interfere
with the crankcase or the clamp mounting
screw.

High Tension
Cord
Grommet
Crankcase

30

4. Service Guide
4-17 Fan Assembly
All Models
● Insert the stopper (special tool) into the plug hole
(refer to “3 Special Tool”).

【HB23/ 26 Series】
】
Fan
Mounting Bolt
Torque:
7.8～11.8N・m
(80～120kgf・cm)

● Tighten the mounting nut so that the fan securely
meets the rotor without looseness.

CAUTION

Mounting Nut
Torque:
9.8～14.7N・m
(100～150kgf・cm)

If the fan is installed with four mounting
bolts, secure them with equal pressure in
diagonal order.

1
3
4

2

Fan

4-18 Backpack Pad Air Supply Pipe Assembly
EB4300/ 6200, EB70 Series, EBZ4800, EBZ51/ 71 Series
Firmly insert the tip of the air supply nozzle into the
frame air inlet pipe.

Nozzle

Frame
Pipe

4-19 Upper Spring Damper Assembly
EBZ30 Series
Volute Cover

Spring Holder

Reassembly of the upper spring damper is the reverse
procedure of disassembly.
Refer to "4-3 Upper Spring Damper Removal".

CAUTION
Check that the each spring edge is firmly
mated with the volute cover and spring
holder's groove.

31

4. Service Guide
4-20 Upper Damper Assembly
EB4300/6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series
Assemble the damper and volute cover by mating
their protrusions.

CAUTION
Check that the damper is not tilted. Improper
installation will result in rapid damage.

Damper Protrusion
Volute Cover Protrusion
Volute Cover

Damper

4-21 Lower Damper Assembly
EB4300/6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series
Grip the damper's metal flange with the pliers in order
not to twist the rubber unit and tighten the mounting
nut with a wrench.

Pliers

Vibration
Proof
Damper

Mounting Nut

Wrench

32

4. Service Guide
4-22 Carburetor Assembly
EBZ71/ 80 Series
Tighten the screws of the earth cord between the
carburetor's adjuster unit and the crankcase.

Carburetor

CAUTION
This cord prevents electrostatic sparks.
Do not fail to connect it.

Earth Cord

4-23 Engine Cover Assembly
Check of the Gasket Assembly
Engine Cover

HB23 Series
When the engine cover is installed, pay attention to
installing the muffler’s gasket to the inside the cover to
protect the fuel tank from heat.

Muffler Gasket
Fuel Tank

Check of the Gasket Assembly
Engine Cover
Carburetor

Insulator Gasket

33

HBZ26 Series
When the engine cover is installed, pay attention to
installing the insulator gasket to the inside of the cover
to protect the carburetor from heat.

4. Service Guide
4-24 Check of the Gasket Assembly
EBZ4800, EBZ51/ 71/ 80 Series
【Intake Side】
】
Insulator Gasket
Cylinder Plate

【Exhaust Side】
】
Muffler Gasket
Cylinder Plate

Check that the master and insulator gaskets are set
inside the cylinder plate before the engine cover is
installed.

CAUTION
If the gasket is improperly set, engine cooling
performance will be reduced.

EB4300/ 6200, EB70 Series
【Intake Side】
】
Volute Case
Insulator Gasket

【Exhaust Side】
】
Cylinder Plate
Muffler Gasket

Check that the master gasket is set outside of the
cylinder plate and the insulator gasket is set inside the
volute case before the engine cover is installed.

CAUTION
If the gasket is improperly set, engine cooling
performance will be reduced.

34

4. Service Guide
Husqvarna Zenoah engine blowers are equipped with spark arresters to prevent spark dispersion.

CAUTION
・ The Spark arrester prevents burnt carbon discharging from the muffler.
Even though the spark arrester can easily clog with carbon, never operate the blower with the
spark arrester detached.
・ The EB4300 and EBZ4800 (Japanese specifications) are not equipped with spark arresters.

4-25 Spark Arrester Removal
HB23 Series, HBZ26 Series
1. Remove the engine cover.
(Refer to “3. Special Tools”)

Muffler
Mounting Bolt
×2

Spark Arrester

2. Remove the two mounting bolts and then remove
the muffler.
Torque:
HB23 Series: 6.9～9.8N・m (70～100kgf・cm)
HBZ26 Series: 6.9～10.8N・m (70～110kgf・cm)
3. Remove the spark arrester.

EBZ30 Series
Muffler

Mounting Bolt
×2

Mounting Bolt
×2

1. Remove the engine cover.
(Refer to “3. Special Tools”)
2. Remove the two mounting bolts and then remove
the muffler.
Torque: 6.9～10.8N・m (70～110kgf・cm)
3. Remove the two mounting bolts (torx) and then
attach the diffuser (diffusing cover).
Torque: 2～3N・m (20～30kgf・cm)
4. Remove the spark arrester.

Diffuser
Spark Arrester

EB4300/ 6200, EB70 Series
1. Remove the engine cover.
(Refer to “3. Special Tools”)

Muffler

Mounting Bolt (long)
×2

Spark Arrester

Mounting Bolt (short)

35

2. Remove the three mounting bolts and then remove
the muffler.
Torque: 7.8～11.8N・m (80～120kgf・cm)
3. Remove the spark arrester.

4. Service Guide
EBZ51/ 71/ 80 Series
Muffler

1. Remove the engine cover.
(Refer to “3. Special Tools”)

Mounting Bolt (long)
×2

2. Remove the three mounting bolts and then remove
the muffler.
Torque: 7.8～11.8N・m (80～120kgf・cm)
Mounting Bolt
×4

3. Remove the four mounting bolts (torx) and then
attach the diffuser (diffusing cover) and the spark
arrester.
Torque: 2～3N・m (20～30kgf・cm)

Diffuser
Spark Arrester
Mounting Bolt (short)

4-26 Spark Arrester Cleaning
Exceptions for EB4300, EBZ4800 (Japanese specifications)
Remove any carbon slag adhering to the spark
arrester (screen) with a brush, preferably wire-type or
equivalent.

CAUTION
Spark Arrester
Spark Arrester

Never overheat the spark arrester with a gas
torch or other flame. The spark arrester may
deform with heat.

4-27 Muffler Cleaning
All Models
Insert a screwdriver into the vent, and wipe away any
carbon buildup. Wipe away any carbon buildup on the
muffler exhaust vent and cylinder exhaust port at the
same time.

Screwdriver

Muffler

36

4. Service Guide
4-28 Air Cleaner Inspection
This device blows fallen leaves to a collection point but at the same time small particles (dust and sand)
become airborne. If such dust invades the engine, the engine mechanism will wear quickly.
So periodically check and clean the element according to the following table.

CAUTION
・ The power blower operating environment is very dusty so the air cleaner will clog more
quickly than that of other power tools. Neglecting air cleaner check and maintenance will
cause rapid engine wear and poor engine performance.
・ The urethane element may deteriorate and crumble if the ambient temperature fluctuates
greatly. If temperature related engine trouble is observed, resolve the trouble cause then
replace the filter with a new one.

Inspection Period
Inspection Item

Daily

Operating Hours
25 hours 50 hours

100 hours

Element

○△

☆

Pre-filter

○△

☆

Paper Filter

○△

○△☆

Remarks
If this material is damaged, deformed, or aged and
crumbling, replace it with a new one.
（Annual replacement is recommended.）
If this filter is cleaned six times or more before the
replacement interval arrives, the paper part darkens
or water or oil adheres, replace it with a new one.
(Annual replacement is recommended)

○: Inspection

△: Clean

☆: Replace

4-29 Element Removal
Single layer dry urethane foam
Clip

HB23 Series
Remove the cover while pressing the clip. Remove
the two elements.

Screen
Elements
Cover

Plate

Silencer

Single layer dry urethane foam

HBZ26 Series, EBZ30 Series
Loosen the knob then remove the element.

Packing

Knob

Screen

Knob

Element
Cover

37

4. Service Guide
Single layer half-wet urethane foam

EB4300/ 6200
Loosen the knob then remove the element.

Screen

Knob
Cover

Knob

Element

Screw

Dual layer half-wet urethane foam

EBZ4800
Loosen the knobs then remove the elements.

Elements
Yellow Black

Screen

Knobs

Packing
Knobs

Cover

Single layer half-wet urethane foam

EBZ51 Series
Loosen the knobs then remove the element.
Screen

Element

Knobs

Packing
Knobs

Cover

Two stage dry element (Pre-filter + Paper filter)

EB70 Series, EBZ71 Series
Loosen the knob bolts then remove the element
(pre-filter + paper filter).

Knob Bolts

Pre-filter
Cover

Paper Filter

38

4. Service Guide
Two stage dry element (Pre-filter + Paper filter)

EBZ80 Series
Loosen the knob bolts then remove the element
(pre-filter + paper filter).

Knob Bolts

Pre-filter
Cover

Case
Paper Filter

4-30 Element Cleaning
Element and pre-filter rinsing

All Models
● Rinse the element carefully with warm water diluted
detergent or washing oil.

CAUTION
Confirm that no deformity, damage or
deterioration (if touched, element will
crumble) exists.
If necessary replace it with a new one.

Warm water diluted
detergent or washing oil

Caution for element installation

● After rinsing it, tighten squeeze the element to
remove moisture.
● For a HB23 series and HBZ26 series element or a
EB70 series and EBZ71/ 80 series pre-filter, dry it
after rinsing and then install it.

EB4300/ 6200, EBZ4800, EBZ51 Series
The half-wet urethane element should be moistened
with 2-cycle engine oil, softly squeezed, then installed.

CAUTION

2-cycle engine oil

・ Excessive oil adhesion will cause filter
clogging.
・ Never moisten pre-filter (EB70 series and
EBZ71/80 series) with engine oil.
If engine oil adheres to the filter, the paper
layer will not function.

Two stage dry paper filter cleaning

EB70 Series, EBZ71/ 80 Series
Blow compressed air from inside/outside of the filter
along the filter element's pleats.

CAUTION
Never beat or hit the filter.

39

5. Structure of Right Hand Throttle Lever
● The right hand throttle lever specifications (RH) employs a governor mechanism for easy blower operation
with constant wind pressure.


It is a mechanism where the throttle lever can be fixed by
a throttle lever lock at a chosen position.
The suitable engine speed can be set for operating load.

Light Handle

Throttle Lever Functional State

Throttle lever
functional area

Throttle lever's
protrusion
Throttle lock lever's protrusion
Throttle Lever Locked State
Throttle Lock Lever

Throttle lever
locking area

Throttle Lever


The throttle lock lever is fixed by plate spring
pressure.
If the plate spring pressure decreases over its
operational life, the throttle lever will lose its
locking function.
If plate spring pressure decreases, replace it
with a new one.

Washer
Spring Washer
Washer
Snap Ring

Shaft
Throttle Lock Lever

Throttle lever
Height: 1.42 to 1.65 mm
(0.056 to 0.065 in.)


Thread the switch cord into the handle case slit and set its terminal 90 to 100 mm (3.54 to 3.94 in.) from the end of the
slit.
＊ Confirm that the switch cord remains slack when the switch is moved.
Switch Cord

90 to 100 mm
(3.54 to 3.94 in.)

Slacken cord.

40

6. Carburetor
6-1 Specifications
Model

Carburetor (Walbro)

Carburetor Specifications
Seal (L-needle)

Metering Lever Valve Opening Valve Closing
Pressure
Height
Pressure
2
2
mm (in.)
kg/ cm (kpa) kg/ cm (kpa)

Sales Region

Blower
Model

Engine
Type

Type
Name

Part
Number

Part Name

Part Number

Adjustment angle
(L-needle return
angle)

EU/ General

HB2302

G23L

WYJ-110A

5516-81000

Limiter Cap

848-F40-80D0

Adjustment

FIXED

# 38

―

9 (0.354)

17 (0.669)

1.5±0.16
(0.059±0.006)

1.3～2.3

0.6～1.6

EU/ General

HBZ2601

GZ25N

WYA-26E

848-F3C-8102

↑

↑

↑

↑

# 37.5

8 (0.315)

9 (0.354)

13.2 (0.520)

↑

↑

↑

USA

HBZ2601

↑

WYA-65

848-F3U-8100

↑

↑

↑

1 3/4±1/2

―

9 (0.354)

7 (0.276)

13.2 (0.520)

↑

↑

↑

USA/ EU/
General

EBZ3000/ RH

GZ30N

WYA-73B

848-F6B-8101

↑

↑

↑

FIXED

# 34

9 (0.354)

7 (0.276)

13.2 (0.520)

↑

↑

↑

General

EB4300

G4K

WYK-67A

3407-81000

↑

↑

↑

↑

# 60

―

13.5

17 (0.669)

↑

↑

↑

EU/ General

EBZ4800

GZ48N

WYA-51B

848-L38-8100

↑

↑

↑

↑

# 45

10.5 (0.413)

10.5 (0.413)

14.5 (0.571)

↑

↑

↑

USA

EBZ5100/ RH

GZ51N3.5

WYA-74A

848-HE0-8100

GZ51N6

WYA-79

848-HE2-8100

↑

↑

↑

↑

# 44

10.5 (0.413)

10.5 (0.413)

14.5 (0.571)

↑

↑

↑

USA

EBZ5100Q

GZ51N7

WYA-83

848-HE6-8100

↑

↑

↑

↑

# 41.5

10.5 (0.413)

10.5 (0.413)

14.5 (0.571)

↑

↑

↑

General

EB6200

G62L

WYK-73A

2750-81000

↑

↑

↑

↑

# 59

―

15 (0.591)

17 (0.669)

↑

↑

↑

EU/ General

EB7000

↑

WYK-123A

T4012-81000

↑

↑

↑

↑

# 53

―

15 (0.591)

17 (0.669)

↑

↑

↑

USA

EBZ7100/ RH

GZ65N

WYA-81

848-H18-8100

↑

↑

↑

↑

# 57

13.5 (0.532)

12.2 (0.480)

14.5 (0.571)

↑

↑

↑

USA/ EU/
General

EBZ8001/ RH

GZ72N

WYA-44B

848-H00-8100

↑

↑

↑

↑

# 59

13. 5 (0.532)

12.2 (0.480)

14.5 (0.571)

↑

↑

↑

Adjustment Angle for Engine Start
(Loosen then tighten)

Model

Throttle
L-needle
Valve Adjust Adjustment
Screw
Angle

Adjustment angle
(H-needle return
angle)

Main Jet

Venturi Bore
(Lead Air)
mm (in.)

Venturi Bore
(Mixture Air)
mm (in.)

Choke Bore
mm (in.)

Engine Speed (rpm)

Standard Engine Speed (rpm)

H-needle
Adjustment
Angle

ID Peak
Engine
Speed

ID Rich
Down

Set ID
Engine
Speed

H Rich
Down

Set H
Engine
Speed

Idling

Full Throttle
(Standard Pipe)

13

FIXED

3400±10

1000～1200

2300±100

FIX JET

FIX JET

2300±200

7300～7600

8 1/2

12 1/2

↑

3700±10

800～1000

2800±100

↑

↑

2800±200

7700～7990

↑

8 1/2

13 1/2

1 7/8

3900±10

1000～1200

2800±100

50～100

7300

2800±200

7300～7800

EBZ3000/ RH

GZ30N

8 1/2

12

FIXED

3500±10

400～100

3000±100

FIX JET

FIX JET

3000±200

6300～6800

General

EB4300

G4K

4 1/2

10 1/2

↑

2700±10

600～800

2000±100

↑

↑

2000±200

6150～6550

EU/ General

EBZ4800

GZ48N

11 1/2

9

↑

3400±10

1000～1200

↑

↑

↑

↑

↑

GZ51N3.5

9

11 1/2

3000±10

700～900

USA

EBZ5100/ RH

2200±100

↑

↑

2200±200

5820～6100

Sales Region

Blower
Model

Engine
Type

EU/ General

HB2302

G23L

9

EU/ General

HBZ2601

GZ25N

USA

HBZ2601

USA/ EU/
General

↑
GZ51N6

6

10

2900±10

600～800

Remarks

Recommended Tools

① 3699-90345
Carburetor Conditioner

② 3699-90211
Leak Tester

Digital magneto controlled misfire
for excessive speed
Maximum speed: 8500 rpm

USA

EBZ5100Q

GZ51N7

3 1/2

10

↑

2900±10

600～800

2200±100

↑

↑

2200±200

5520～5800

General

EB6200

G62L

4

10 1/2

↑

2500±10

400～600

2000±100

↑

↑

2000±200

7500～7800

EU/ General

EB7000

↑

7

10 1/2

↑

2700±10

600～800

↑

↑

↑

↑

7100～7500

USA

EBZ7100/ RH

GZ65N

7

12

↑

2700±10

600～800

2000±100

↑

↑

2000±200

6850～7150

Digital magneto controlled misfire
for excessive speed
Maximum speed: 8500 rpm

USA/ EU/
General

EBZ8001/ RH

GZ72N

6 1/2

12

↑

2700±10

600～800

2000±100

↑

↑

2000±200

6500～6800

Digital magneto controlled misfire
for excessive speed
Maximum speed: 8500 rpm

③ 3699-90537
Tachometer PET-1000

④ 848-8W9-0080
Limiter Cap Tool

41

6. Carburetor
6-2 Carburetor Configuration
Inspection and adjustment items
Execute the following check and adjustment if the carburetor does not function normally.
(Refer to "6-5 Idling Speed Adjustment " and "6-6 Carburetor Inspection".)
● Fuel adjustment when idling
● Check of the body assembly
● Check of the main check valve
● Check of throttle valve
Readjust the engine rotational speed referring to "6-7 Carburetor Adjustment"
if the engine speed is not steady after the above-mentioned adjustment and the checks are executed.

Construction
【Type: WYJ】
】

【Type: WYA】
】

L- needle

L-needle
Throttle Valve Assembly

Throttle Valve Assembly

H-needle
【USA/ HBZ2601 only】
】

Main Jet

Main Check Valve

Main Jet
Screen

Inlet Valve

Main Check Valve

Screen

Body Assembly
Inlet Valve

Body Assembly

Metering Lever
Main Diaphragm
Metering Lever
Main Diaphragm

42

6. Carburetor
6-3 Carburetor Conforms to Exhaust Emissions Regulations
The carburetor flow rates of all Hasqvarna Zenoah engine blowers are individually pre-adjusted to pass
exhaust emissions regulations.
A limiter cap is installed in the idling limiter to prevent an operator carelessly changing the idle setting resulting
in non-conformance with exhaust emission regulations.
Execute a correct adjustment according to "6-7 Carburetor Adjustment".
A limiter cap closes the L-needle adjustment hole of
the throttle valve.

L-needle

Throttle Valve

Limiter Cap

ATTENTION!!! IMPORTANT!!!
Carburetor adjustments with caps removed must be conducted by Emission Certified
Servicing Dealers ONLY.
The dealer must supply the unit to the customer in original configuration, using the
manufacturer’s carburetor adjustment procedure, which includes having the limiter caps in
place before the unit is put into service.
Knowingly removing or rendering inoperative any device, element, or design installed on or in
a non-road engine which is in compliance with E. P. A. or C. A. R. B. (USA), STAGEⅢ
Ⅲ(EU)
regulations is classified as TAMPERING.
TAMPERING is a violation of FEDERAL LOW, resulting in significant civil penalties (fines) of up
to $25,000 for each violation.

43

6. Carburetor
6-4 Limiter Cap Removal/ Installation
Tool
Limiter cap tool extraction side
Limiter Cap Tool
Screw unit
(M2 counterclockwise threading)

The limiter cap tool (carburetor maintenance tool:
848-8W9-0080) is used for limiter cap
installation/removal.

Limiter cap insertion side

Removal
Limiter cap tool extraction side
Press it while turning it
counterclockwise.

Pull it out.

Insert the limiter cap tool extraction tool's threading
(M2 counterclockwise threading) into the idling
limiter's hole and screw it counterclockwise while
giving pressure.
When it is firmly threaded, pull the limiter cap.

CAUTION

Limiter Cap

Limiter cap is
removed.

If it is difficult to screw in the limiter cap tool,
firmly press the tool while screwing. When
threads are completely meshed, pull it out in
one stroke. If cap is damaged and stays in
the hole, use a pick type tool to remove it.

Installation
Insert a new limiter cap in the low speed mixture
needle hole. Press the cap deeply into low speed
mixture needle hole to prevent tampering.

Limiter cap insertion side

CAUTION

Limiter cap
(new part)

Be sure to install only a new limiter cap.
The limiter cap is a very small part. Pay
attention not to lose it.

6-5 Idling Speed Adjustment
Slow and Middle Speeds

All Models

Adjust the fuel supply under idling conditions by turning the idling limiter.

Screw Driver

Increases

Decreases

1. Remove the limiter cap.
(Refer to "6-4 Limiter Cap Removal/ Installation".)

CAUTION
After completion of the adjustment, be sure
to install the limiter cap.
2. Turn the screw with a commercially available screw
driver (tip width: 2.5mm).
Clockwise (CW):
Fuel mixture becomes lean. (Speed increases.)
Counterclockwise (CCW):
Fuel mixture becomes rich. (Speed decreases.)

44

6. Carburetor
High Speed Adjustment

【USA/ HBZ2601 only】
】
Increases

High speed revolutions are adjusted by a H-needle.
Clockwise (CW):
Fuel mixture becomes lean. (Speed increases.)
Counterclockwise (CCW):
Fuel mixture becomes rich. (Speed decreases.)

H-needle
Decreases

6-6 Carburetor Inspection
Inlet Valve Leaking Test
Connect a leak tester to the fuel inlet port of the carburetor.
After filling the metering chamber with fuel, apply pressure to the inlet valve and read the opening pressure
and the reseating pressure.

a. Body assembly normality check

Metering Lever

1.5±0.16 mm
(0.059±0.006 in.)
Body
Assembly

● Measure the metering lever height using a depth
gauge or scale.
The appropriate value is 1.5±0.16 mm (0.059±
0.006 in.)
● Check that no wear exists on the metering lever or
diaphragm contacting areas.
If wear exists, replace it with a new one.
● Remove the inlet valve and check for dirt, sludge,
rusting and/or step-wear.
Replace the inlet valve if a step is found on the
rubber tip.

Main Diaphragm
Valve Sheet

Metering Lever

Inlet Valve

● Check that no alien matter adheres to the valve
sheet part. If any alien matter exists, dip the valve
sheet in gasoline for about 10 minutes and remove
it, or use the carburetor conditioner (Carburetor
Conditioner: 699-90345) to clean it.

Rubber Tip

Body Assembly

45

Screen

● Check that no alien matter has accumulated on the
screen.
If screen is clogged with alien matter, remove the
screen and clean it.

6. Carburetor
b. Judgments of the main check valve
● As illustrated, hold a plastic pipe on the check
valve and blow and suck air by your mouth. If the
air is stopped by blowing, and open by sucking, the
valve has no failure.

Plastic Pipe
Main Check Valve
Body Assembly

● In case of failure, soak the valve into gasoline for
about 10 minutes and repeat blowing and sucking
several times.
If this is not successful, replace the body assembly.
● Make sure to check the valve in case fuel is not
supplied though the priming pump is operated.

c. Throttle valve normality check
● Check that no wear exists in the throttle valve slide.
Carefully slide a screw driver tip along the plunger's
contact surface.
If the screw driver tip catches in a groove, replace
the carburetor assembly with a new one.

Throttle Valve Assembly

Contact Surface

Plunger

● Check that no wear exists on the jet needle.
If there are signs of vertical linear flaws or wear,
replace the carburetor assembly with a new one.

CAUTION
Even small damage will increase fuel
consumption.
Jet Needle Portion

Damage

Wear

46

6. Carburetor
6-7 Carburetor Adjustment
Before performing carburetor adjustment, the following areas must be inspected for good
working order.
● Correct spark plug set to specified gap must be installed.
● The air filter and paper filter must be clean and properly installed.
● The muffler spark arrestor screen and exhaust port must be clear of carbon.
● The fuel filter must be clean and properly installed.
● The carburetor and carburetor insulator block screw must be tight.
● The fuel must be fresh (properly mixed at 40:1 ratio with Zenoah or 50:1 ratio with RedMax)
● All standard air tubes (Air Pipes) must be installed.
● No fallen leaf or other matter must be adhered to the air intake.

Required Tools and Parts
● Carburetor adjustment screw driver 2.5mm flat tip
● Electronic digital tachometer
● Limiter cap removal tool
● New Limiter cap

Adjustment when engine activated
1st Time

2nd Time

3rd Time

1. Start the engine and alternate three times between
the idling state (10 seconds) and full throttle state
(60 seconds). Then check the engine's condition.

Full
Throttle

Idling

L-needle

2. If idling is not stable, remove the limiter cap (refer
to "6-4 Limiter Cap Removal/ Installation") and
adjust the engine according to the following
procedure.

1/8 turn

Throttle Valve
Adjust Screw

● Throttle valve adjust screw
Clockwise (CW) 1&1/2 turn:
Increases engine speed.

1&1/2 turn
【USA/ HBZ2601 only】
】

● H-needle 【 USA/ HBZ2601 only】
】
Counterclockwise (CCW) 1/8 turn:
Reduces engine speed.

H-needle

1/8 turn

47

● L-needle
Counterclockwise (CCW) 1/8 turn:
Enriches the fuel mixture.
(Reduces engine speed.)

3. Run the warm-up operation (see the above table)
and execute the rich down adjustment.
(Refer to "Rich Down Adjustment".)

6. Carburetor
Adjustment if engine does not activate
Set the adjustable parts as specified according to the
following procedure.

L-needle

1. Loosen the throttle valve adjust screw until the
throttle valve becomes completely free, then turn
the screw clockwise until the regulated angle is
attained.
(Refer to "6-1 Specifications- Adjustment Angle for
Engine Start".)

Throttle Valve
Adjust Screw

【USA/ HBZ2601 only】
】
H-needle

2. Turn the idling limiter (L-needle) counterclockwise
until it becomes free. (When the needle screw
completely loosens, a click tone can be heard.)
Turn the idling limiter clockwise from this position
until the regulated angle is attained.
(Refer to "6-1 Specifications- Adjustment Angle for
Engine Start- L-needle Adjustment Angle".)

CAUTION
When tightening the L-needle clockwise,
never excessively tighten it.
Doing so may cause damage to the needle
surface resulting in excessive or inconsistent
fuel supply.
3. H-needle 【 USA/ HBZ2601 only】
】
Clockwise (CW) completely, then back it off 1&7/8
turns counterclockwise (CCW).
4. Start the engine and execute the rich down
adjustment. (Refer to "Rich Down Adjustment".)

CAUTION
If the engine still does not start, problems
may exist elsewhere than the carburetor.
Check those other causes.

48

6. Carburetor
Rich Down Adjustment
1. Turn the idling limiter (L-needle) clockwise to the
position of maximum engine speed.

L-needle

2. Turn the throttle valve adjust screw in either
direction to match to the regulated ID peak speed.
(Refer to "6-1 Specifications- ID Peak Engine
Speed".)

Throttle Valve
Adjust Screw

3. Turn the L-needle counterclockwise and execute
the rich down adjustment.
(Refer to "6-1 Specifications- ID Rich Down".)

Rich Down:
Adjust the idle needle to a slightly richer mixture in order
to maintain a stable idling speed and get a good
acceleration.
Best
Rich Down

4. Turn the throttle valve adjust screw in either
direction and set the ID speed.
(Refer to "6-1 Specifications- Set ID Engine
Speed".)
5. Check that rotational speed accelerates normally
between idling state and full throttle within the
regulated number of revolutions.
(Refer to "6-1 Specifications- Standard Engine
Speed".)

Consumption (ℓ/h)

Peak

(rpm)
Set engine speed

Peak engine speed

【USA/ HBZ2601 only】
】
After the above adjustment is completed, adjust the
H-needle.

H-needle

1. Turn the H-needle clockwise so that the speed
reaches its peak (7300 to 7800 rpm).
2. When the speed reaches its peak, turn the
H-needle counterclockwise until the speed falls 50
to 100 rpm. (Set H Engine Speed: 7300 rpm)

REFERENCE
The HBZ2601 rich down procedure might not
optimize the L-needle and H-needle
relationship at first try.
If so repeat this procedure twice.

49

6. Carburetor
Confirmation after adjustment
Dust Cover

● After adjustment is completed, be sure to install the
new limiter cap.
(Refer to "6-4 Limiter Cap Removal/ Installation".)
● Be sure to reattach the dust cover.

Limiter Cap

CAUTION
If the engine is run while the throttle valve's
dust cover is removed, dust or alien matter
may adhere to the throttle valve's rear
contoured or the plunger contacting
surfaces.
If they become worn, the L-needle will fall
causing engine start failure.

50

7. Maintenance Standards
7-1 Engine
Maintenance Item
Category
Engine Type
Model

Cylinder

Blower Model

mm (in.)

Piston Diameter
(Skirt)

mm (in.)

Top

mm (in.)

2nd

mm (in.)

Piston Pin Hole

mm (in.)

Clearance Between
mm (in.)
Piston and Cylinder

Clearance
Between
Piston
Groove and
Piston Ring

Top

2nd

Fitting Between
Piston Pin and
Piston Pin Hole

Piston Ring

－

Bore

Piston Ring
Groove Width

Piston

Unit
－
－

mm (in.)

mm (in.)

mm (in.)

End Gap at Cylinder
mm (in.)
Skirt
Width

Piston Pin Diameter

mm (in.)
mm (in.)

Small End Bore
mm (in.)
Connecting
Parallelism of
Rod
Large/ Small End
Bores
Diameter at Main
mm (in.)
Crankshaft Bearing
(Starter
Side)
Diameter at Oil Seal mm (in.)
Crankshaft
(Fan Side)

Crankshaft
Complete

Diameter at Main
Bearing

mm (in.)

Diameter at Oil Seal mm (in.)

Specifications
G23L
HB2302
HB2311EZ

GZ30N

G4K

EBZ3000/ 3000RH
EBZ3050RH

HBZ2601

GZ48N

EB4300

EBZ4800

Standard

Limit

Standard

Limit

Standard

Limit

Standard

Limit

Standard

Limit

φ32.00
(1.2598)

φ32.06
(1.2622)

φ34.00
(1.3386)

φ34.06
(1.3409)

φ38.00
(1.4961)

φ38.06
(1.4984)

φ40.00
(1.5748)

φ40.06
(1.5772)

φ43.00
(1.6929)

φ43.06
(1.6953)

Backpack Blower
GZ51N
EBZ5100/ 5100RH/
5100Q
EBZ5150/ 5150RH/
5150Q
Standard
Limit
φ44.00
(1.7323)

φ44.06
(1.7346)

G62L

GZ65N

GZ72N

EB6200
EB7000
EB7001

EBZ7100/ 7100RH
EBZ7150/ 7150RH

EBZ8001/ 8001RH
EBZ8050/ 8050RH

Standard

Limit

Standard

Limit

Standard

Limit

φ47.50
(1.8701)

φ47.56
(1.8724)

φ47.53
(1.8713)

φ47.59
(1.8736)

φ50.03
(1.9697)

φ50.09
(1.9720)

Measuring
Instrument

Service
Procedure

Cylinder Gauge

Replacement
(Plating Damaged
Replacement)

φ31.945
φ33.960
φ39.960
φ42.955
φ43.965
φ47.455
φ47.458
φ49.958
φ37.950
(1.2577)
(1.3370)
(1.5732)
(1.6911)
(1.7309)
(1.8683)
(1.8684)
(1.9669)
(1.4941) φ37.86
φ31.86
φ33.86
φ39.87
φ42.87
φ47.37
φ43.88
φ47.37
φ49.87
Micrometer
(1.2543) ～φ33.975
(1.3331) ～φ37.970
(1.5697) ～φ42.970
(1.6878) ～φ43.985
(1.8650) ～φ49.978
(1.4906) ～φ39.975
(1.7276) ～φ47.470
(1.8650) ～φ47.478
(1.9634)
～φ31.960
(1.4949)
(1.2583)
(1.3376)
(1.5738)
(1.6917)
(1.7317)
(1.8689)
(1.8692)
(1.9676)
1.51
1.03
1.23
1.57
1.25
1.25
1.30
1.55
1.60
1.25
1.25
1.30
1.60
1.30
1.30
1.60
1.30
1.30
(0.0512)
(0.0630)
(0.0512)
(0.0594)
(0.0630)
(0.0406)
(0.0512)
(0.0484)
(0.0512)
(0.0618)
(0.0630)
(0.0492)
(0.0512)
(0.0492)
(0.0610)
(0.0492)
(0.0512)
(0.0492)
Thickness Gauge
1.51
1.01
1.21
1.57
1.22
1.22
1.30
1.53
1.60
1.23
1.23
1.30
1.60
1.30
1.30
1.60
1.30
1.30
(0.0512)
(0.0630)
(0.0512)
(0.0594)
(0.0630)
(0.0398)
(0.0512)
(0.0476)
(0.0512)
(0.0618)
(0.0630)
(0.0480)
(0.0512)
(0.0480)
(0.0602)
(0.0484)
(0.0512)
(0.0484)
φ8.04
φ8.04
φ9.04
φ11.04
φ11.04
φ12.05
φ7.990
φ7.995
φ8.995
φ10.995
φ10.995
φ10.995
φ11.04
φ10.995
φ11.04
φ11.995
φ11.995
φ12.05
Cylinder Gauge
(0.3146)
(0.3165)
(0.3148)
(0.3165)
(0.3541)
(0.3559)
(0.4329)
(0.4346)
(0.4329)
(0.4346)
(0.4329)
(0.4329)
(0.4722)
(0.4744)
(0.4722)
(0.4346)
(0.4346)
(0.4744)
0.040
0.025
0.030
0.025
0.030
0.015
0.030
0.052
0.052
(0.0016)
(0.0010)
(0.0012)
(0.0010)
(0.0012)
(0.0006)
(0.0012)
(0.0020)
(0.0020)
0.18
0.19
0.22
Micrometer,
0.20
0.20
0.20
0.19
0.19
0.22
Cylinder Gauge
～0.080 (0.0079)
～0.065 (0.0079)
～0.075 (0.0079)
～0.065 (0.0074)
～0.070 (0.0075)
～0.060 (0.0071)
～0.065 (0.0075)
～0.092 (0.0087)
～0.092 (0.0087)
(0.0031)
(0.0026)
(0.0030)
(0.0026)
(0.0028)
(0.0024)
(0.0026)
(0.0036)
(0.0036)
0.02
0.04
0.04
0.08
0.06
0.06
0.06
0.06
0.06
(0.0008)
(0.0016)
(0.0016)
(0.0031)
(0.0024)
(0.0024)
(0.0024)
(0.0024)
(0.0024)
0.15
0.15
0.15
0.10
0.10
0.10
0.15
0.15
0.15
～0.06 (0.0039)
～0.08 (0.0039)
～0.08 (0.0039)
～0.12 (0.0059)
～0.10 (0.0059)
～0.10 (0.0059)
～0.10 (0.0059)
～0.10 (0.0059)
～0.10 (0.0059)
(0.0024)
(0.0031)
(0.0031)
(0.0047)
(0.0039)
(0.0039)
(0.0039)
(0.0039)
(0.0039)
Thickness Gauge
0.02
0.02
0.02
0.08
0.03
0.03
0.04
0.04
0.04
(0.0008)
(0.0008)
(0.0008)
(0.0031)
(0.0012)
(0.0012)
(0.0016)
(0.0016)
(0.0016)
0.15
0.15
0.15
0.10
0.10
0.10
0.15
0.15
0.15
(0.0039)
～0.06 (0.0039)
～0.06 (0.0039)
～0.06
～0.12 (0.0059)
～0.07 (0.0059)
～0.07 (0.0059)
～0.08 (0.0059)
～0.08 (0.0059)
～0.08 (0.0059)
(0.0024)
(0.0024)
(0.0024)
(0.0047)
(0.0028)
(0.0028)
(0.0031)
(0.0031)
(0.0031)
0.010T
0.005T
0.005T
0.005T
0.005L
0.005L
0.005L
0.005L
0.005L
(0.00039T)
(0.00020T)
(0.00020T)
(0.00020T)
(0.00020T)
(0.00020T)
(0.00020T)
(0.00020T)
(0.00020T)
0.06L
0.06L
0.07L
Micrometer,
0.06L
0.06L
0.06L
0.06L
0.06L
0.07L
～0.006L (0.00024L)
～0.011L (0.00024L)
～0.011L (0.00024L)
～0.011L (0.00024L)
～0.021L (0.00024L)
～0.021L (0.00024L)
～0.021L (0.00024L)
～0.021L (0.0028L)
～0.021L (0.0028L) Cylinder Gauge
(0.00024L)
(0.00043L)
(0.00043L)
(0.00043L)
(0.00083L)
(0.00083L)
(0.00083L)
(0.00083L)
(0.00083L)
0.10
0.10
0.10
0.10
0.10
0.10
0.15
0.15
0.15
(0.0039)
(0.0039)
(0.0039)
(0.0039)
(0.0039)
(0.0039)
(0.0059)
(0.0059)
(0.0059)
0.50
0.6
0.6
0.50
0.50
0.50
0.50
0.50
0.6
Thickness Gauge
～0.30 (0.0197)
～0.30 (0.0197)
～0.30 (0.0197)
～0.30 (0.0197)
～0.30 (0.0197)
～0.30 (0.0197)
～0.35 (0.0236)
～0.35 (0.0236)
～0.35 (0.0236)
(0.0118)
(0.0118)
(0.0118)
(0.0118)
(0.0118)
(0.0118)
(0.0138)
(0.0138)
(0.0138)
1.5
1.0
1.2
1.5
1.2
1.2
1.1
1.5
1.4
1.2
1.2
1.1
1.4
0.9
1.1
1.4
1.1
1.1
Micrometer
(0.0433)
(0.0551)
(0.0433)
(0.0591)
(0.0551)
(0.0394)
(0.0354)
(0.0472)
(0.0433)
(0.0591)
(0.0551)
(0.0472)
(0.0433)
(0.0472)
(0.0591)
(0.0472)
(0.0433)
(0.0472)
φ7.98
φ7.98
φ8.98
φ10.98
φ10.98
φ11.98
φ8.00
φ8.00
φ9.00
φ11.00
φ11.00
φ11.00
φ10.98
φ11.00
φ10.98
φ12.00
φ12.00
φ11.98
Micrometer
(0.3150)
(0.3142)
(0.3150)
(0.3142)
(0.3543)
(0.3535)
(0.4331)
(0.4323)
(0.4331)
(0.4323)
(0.4331)
(0.4331)
(0.4724)
(0.4717)
(0.4724)
(0.4323)
(0.4323)
(0.4717)
φ11.00
φ11.00
φ12.00
φ15.00
φ15.00
φ15.00
φ15.03
φ15.00
φ15.03
φ16.00
φ16.00
φ16.03
φ11.03
φ11.03
φ12.03
φ15.03
φ15.03
φ16.03
Cylinder Gauge
(0.4331)
(0.4331)
(0.4724)
(0.5906)
(0.5906)
(0.5906)
(0.5906)
(0.6299)
(0.6299)
(0.5917)
(0.5917)
(0.6311)
(0.4343)
(0.4343)
(0.4736)
(0.5917)
(0.5917)
(0.6311)
φ12.00
(0.4724)
φ12.00
(0.4724)
φ12.00
(0.4724)
φ12.00
(0.4724)

Eccentricity

mm (in.)

-

Width Between
Crank Webs

mm (in.)

22.0
(0.8661)

Axial Play

mm (in.)

-

－

-

Main Bearing (Ball Bearing)

Handheld Blower
GZ25N

0.15/ 100
φ11.97
(0.4713)
φ11.90
(0.4685)
φ11.97
(0.4713)
φ11.90
(0.4685)
0.07
(0.0028)
21.9
(0.8622)
～22.1
(0.8701)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ12.00
(0.4724)
φ12.00
(0.4724)
φ12.00
(0.4724)
φ12.00
(0.4724)
22.0
(0.8661)
-

-

0.15/ 100
φ11.97
(0.4713)
φ11.90
(0.4685)
φ11.97
(0.4713)
φ11.90
(0.4685)
0.07
(0.0028)
21.9
(0.8622)
～22.1
(0.8701)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ12.00
(0.4724)
φ12.00
(0.4724)
φ12.00
(0.4724)
φ12.00
(0.4724)
24.0
(0.9449)
-

-

0.15/ 100
φ11.97
(0.4713)
φ11.90
(0.4685)
φ11.97
(0.4713)
φ11.90
(0.4685)
0.07
(0.0028)
23.9
(0.9409)
～24.1
(0.9488)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
29.0
(1.1417)
-

-

0.15/ 100
φ14.95
(0.5886)
φ14.90
(0.5866)
φ14.95
(0.5886)
φ14.90
(0.5866)
0.07
(0.0028)
28.9
(1.1378)
～29.1
(1.1457)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
29.0
(1.1417)
-

-

0.15/ 100
φ14.95
(0.5886)
φ14.90
(0.5866)
φ14.95
(0.5886)
φ14.90
(0.5866)
0.07
(0.0028)
28.9
(1.1378)
～29.1
(1.1457)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
29.0
(1.1417)
-

-

0.15/ 100
φ14.95
(0.5886)
φ14.90
(0.5866)
φ14.95
(0.5886)
φ14.90
(0.5866)
0.07
(0.0028)
28.9
(1.1378)
～29.1
(1.1457)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
φ15.00
(0.5906)
29.0
(1.1417)
-

-

0.15/ 100
φ14.95
(0.5886)
φ14.90
(0.5866)
φ14.95
(0.5886)
φ14.90
(0.5866)
0.07
(0.0028)
28.9
(1.1378)
～29.1
(1.1457)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ16.00
(0.6299)
φ16.00
(0.6299)
φ16.00
(0.6299)
φ16.00
(0.6299)
29.0
(1.1417)
-

-

0.15/ 100
φ15.95
(0.6280)
φ15.90
(0.6260)
φ15.95
(0.6280)
φ15.90
(0.6260)
0.07
(0.0028)
28.9
(1.1378)
～29.1
(1.1457)
0.5
(0.0197)
Flutter,
irregular
noise
generated

φ16.00
(0.6299)
φ16.00
(0.6299)
φ16.00
(0.6299)
φ16.00
(0.6299)
29.0
(1.1417)
-

-

0.15/ 100

Mandrel Dial
Gauge

φ15.95
Micrometer
(0.6280)
φ15.90
Micrometer
(0.6260)
φ15.95
Micrometer
(0.6280)
φ15.90
Micrometer
(0.6260)
0.07
Dial Gauge,
(0.0028)
Center Support
28.9
(1.1378)
Micrometer
～29.1
(1.1457)
0.5
Thickness Gauge
(0.0197)
Flutter,
irregular
noise
generated

Replacement

Replacement

Replacement
Piston
Replacement

Replacement

Replacement

Replacement

Replacement
Replacement
Replacement
Replacement
Replacement
Replacement
Replacement
Replacement
Repair or
Replacement
Repair or
Replacement
Repair (Shim)

Replacement

51

7. Maintenance Standards
7-2 Tightening Torques
Tightening Item
Category
Engine Type
Model

Unit
－
－

Blower Model
Thread size
Spark Plug

Torque
Thread size

Muffler

Torque
Thread size

Cylinder

Torque
Thread size

Crank Case

Torque
Thread size

Insulator

Torque
Thread size

Engine

Air Cleaner and Carburetor
Chalk Cup and Carburetor
（Large Air Cleaner）
）

Torque
Thread size
Torque
Thread size

Recoil Starter

Torque
Thread size

Starter Pulley

Torque
Thread size

Rotor

Torque
Thread size

Coil

Torque
Thread size

Engine Mount
Volute Case,
Volute Cover,
Engine Cover

Torque
Thread size
Torque
Thread size

Fan

Torque
Thread size

Large Air Cleaner

Torque
Thread size
Torque
Thread size

Common Tightening Torque

Torque
Thread size
Torque

－

Specifications
Handheld Blower
GZ25N

G23L
HB2302
HB2311EZ

HBZ2601
M10x1.0
100～140
(9.8～13.7)
←
70～110
(6.9～10.8)
←
60～90
(5.9～8.8)
←
50～80
(4.9～7.8)
←
30～50
(2.9～4.9)
←
30～60
(2.9～5.9)

GZ30N

G4K

GZ48N

EBZ3000/ 3000RH
EBZ3050RH

EB4300

EBZ4800

mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)

M14x1.25
150～220
(14.7～21.6)
M5x0.8
70～100
(6.9～9.8)
M5x0.8
60～80
(5.9～7.8)
M5x0.8
35～45
(3.4～4.4)
M5x0.8
30～40
(2.9～3.9)
M5x0.8
30～40
(2.9～3.9)

mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)

M4x0.7
15～20
(1.5～2.0)
M8x1.0
120～180
(11.8～17.6)
M8x1.0
100～150
(9.8～14.7)
M4x0.7
25～40
(2.5～3.9)
M5x0.8
30～40
(2.9～3.9)
P5
20～25
(2.0～2.5)

M5x0.8
30～60
(2.9～5.9)
M8x1.25
70～110
(6.9～10.8)
←

←

←

←

←
25～50
(2.5～4.9)
←

←
25～40
(2.5～3.9)
←
40～60
(3.9～5.9)
←
30～40
(2.9～3.9)

mm
kgf・cm
(N・m)

M8x1.0
100～150
(9.8～14.7)

←

←
←
←

←

M10x1.0
90～130
(8.8～12.7)
←

←
60～80
(5.9～7.8)
←

M14x1.25
150～220
(14.7～21.6)
M6x1.0
80～120
(7.8～11.8）
←
50～80
(4.9～7.8)
←

←
←
50～70
(4.9～6.9)
←

←
←
←
←

←

←
←

←
←

M6x1.0
80～120
(7.8～11.8)

Backpack Blower
GZ51N
EBZ5100/ 5100RH/
5100Q
EBZ5150/ 5150RH/
5150Q
←

M4x0.7
10～15
(1.0～1.5)
M5x0.8
20～35
(2.0～3.4)
M6x1.0
40～60
(3.9～5.9)

GZ65N

GZ72N

EB6200
EB7000
EB7001

EBZ7100/ 7100RH
EBZ7150/ 7150RH

EBZ8001/ 8001RH
EBZ8050/ 8050RH

M10x1.0
90～130
(8.8～12.7)
←

←

←

M14x1.25
150～220
(14.7～21.6)
←

←

←

←

←

←

←
60～90
(5.9～8.8)
←

←

←
60～90
(5.9～8.8)
←

←

←

←
50～80
(4.9～7.8)
←

←

←

←

←

←

←

←
50～80
(4.9～7.8)
←
30～45
(2.9～4.4)

←
30～50
(2.9～4.9)
←

←
40～60
(3.9～5.9)
←

←
40～60
(3.9～5.9)

←

←

←

←
50～80
(4.9～7.8)
←
30～45
(2.9～4.4)
M5xL50
30～45
(2.9～4.4)

M5xL60

←

←

←

←

←

←

←

M10x1.25

←

←
30～45
(2.9～4.4)
M10x1.0
180～230
(17.6～22.5)
M10x1.0
200～300
(19.6～29.4)
←

←

←

←
←

←
←

←

←

←

←

←

←

←

←
30～45
(2.9～4.4)
←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←
250～350
(24.5～34.3)
←

←

←

←

←

←

←

←

M6x1.0
60～80
(5.9～7.8)
←
20～30
(2.0～2.9)

←

←

←

←

←

←

←

←

←

←

←
25～30
(2.5～2.9)

←
45～55
(4.4～5.4)

←
25～35
(2.5～3.4)

←
30～40
(2.9～3.9)

←

←

←

←

←

←

←

←

←

←

←

←

←

M5x0.8
25～35
(2.5～3.4)

←

←

←

←

mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)
mm
kgf・cm
(N・m)

G62L

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

←

52

8. Troubleshooting
8-1 Engine does not start
Remove the spark plug from the cylinder. Put the spark plug on the outside of the cylinder.
Pull the recoil starter knob, and check whether sparks arise in the spark gap or not.
Trouble

Probable Cause

Countermeasure

No spark in the spark plug.
Spark plug

1. Wet spark plug electrodes

Make them dry.

2. Carbon deposited on the electrodes
3. Insulation failure by insulator damage

Clean.
Replace.

4. Improper spark gap

Adjust to
0.6～0.7 mm (0.023～0.028 in.).

5. Burn out of electrodes

Replace.

Magneto

1. Ignition coil inside failure
2. Damaged cable sheath

Replace.
Replace or repair.

Switch

1. Switch is OFF
2. Switch is failure

ON the switch.
Replace.

3. Primary wiring ground

Repair.

Sparks appear in the spark plug.
Compression and
fueling is normal

1. Over sucking of fuel

Drain excess fuel.

2. Too rich fuel
3. Overflow

Adjust carburetor.
Adjust or replace carburetor.

4. Clogging air cleaner
5. Incorrect fuel

Wash with mixed gasoline.
Change with proper fuel.

Fueling normal but
poor compression

1. Worn out cylinder, piston, or piston ring
2. Gas leakage from cylinder and crank case gasket

Replace.
Apply liquid gasket and reassemble.

No fuel supply

1. Choked breather air hole
2. Clogged carburetor

Clean.
Clean.

3. Clogged fuel filter

Replace fuel filter.

8-2 Engine stop during operation
Trouble
Suddenly stopped.

Gradual speed
reduction and
stopped.

Probable Cause

Countermeasure

1. Switch is OFF

ON the switch.

2. Plug cap disconnect

Connect properly.

3. Short circuit by carbon deposited on the plug electrodes
4. Switch cord or high tension cord sheath worn out

Clean.
Replace.

5. Ignition coil inside failure
6. Engine seizure

Replace.
Overhaul and replace damaged parts.

1. Lack of fuel
2. Clogged carburetor

Refill.
Clean.

3. Water mixed to fuel

Drain and apply new fuel.

8-3 Engine cannot be stopped
Trouble
Overheating

Switch

Probable Cause

Countermeasure

1. Lean fuel

Adjust carburetor.

2. Cylinder fin clogged with dusts

Clean.

3. Improper fuel
4. Carbon deposited inside of combustion chamber

Change with proper fuel.
Clean.

5. Spark plug electrode red hot

Clean thoroughly and adjust spark gap
to 0.6～0.7mm (0.023～0.028in.).

1. Faulty switch

Replace.

2. Cord failure

Repair.

53

8. Troubleshooting
8-4 Lack of output power or unstable revolution
Trouble

Probable Cause

Compression is
1. Air is entering at fuel pipe joints, etc
normal and no misfire. 2. Air is entering at intake tube joint or carburetor joint
3. Water in fuel
4. Piston is starting to seize
Overheating

Replace gasket or tighten screws.
Replace with clean fuel.
Filing of seized surface with fine files.

5. Muffler choked with carbon

Clean.

1. Fuel too lean

Adjust carburetor.

2. Clogging of cylinder fins with dust
3. Poor fuel quality

Clean.
Replace with clean fuel.

4. Carbon deposited in the combustion chamber

Clean.
Clean thoroughly and adjust spark gap
to 0.6～0.7 mm (0.023～0.028 in.).

5.Spark plug electrode red hot
Others

Countermeasure
Secure connections.

1. Dirty air cleaner

Wash with mixed gasoline.

2. Over loading

Reduce load.

8-5 The amount of the wind is weak
Trouble

Probable Cause

Good compression
1. The air cleaner element is clogged.
but cannot reach the
2. Carbon adheres to the spark arrester.
required revolutions at
3. Carburetor is damaged.
full throttle

54

Countermeasure
Clean the element.
Clean the spark arrestor.
Maintenance or replace.

Printed in Japan 0901
SY – 015



---

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