Stihl Bg75 Manual BG 75

2014-07-06

: Stihl Bg75-Manual bg75-manual stihl pdf

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III

STIHL BG 75
Instruction Manual
Owner's Manual
Assembling
Safety Precautions
Operating Instructions
Maintenance

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Parts and Controls
Definitions
Safety Precautions
Assembling the Blower
Fuel Mix
Fueling
Starting
Using the blower
Cleaning the Air Filter
Adjusting the Carburetor
Motormanagement
Spark Arresting Screen in Muffler
Checking the Spark Plug
Replacing the Starter Rope
and Rewind Spring

Printed on chlorine-free paper

2
3
4
10
11
11
12
14
16
16
16
17
18
19

Operating Instructions
Maintenance Chart
Specifications
Special Accessories
Storing the Machine
STIHL Incorporated Federal and
California Emission Control
Warranty Statement

21
22
23
23
23

This Manual contains operating and
safety instructions for all STIHL BG 75
blowers.
Pay special attention to the safety
precautions outlined on pages 4 to 9.
Allow only persons who understand this
Manual to operate your blower.
To receive maximum performance and
satisfaction from your STIHL blower, it is
important that you read and understand
the maintenance and safety precautions
before using your blower.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
Manual.
:DUQLQJ
Because a blower is a high-speed tool,
some special safety precautions must
be observed as with any other power
tool to reduce the risk of personal injury.
Careless or improper use may cause
serious or even fatal injury.
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time-to-time.
If the operating characteristics or the
appearance of your blower differ from
those described in this Manual,
please contact your STIHL dealer for
information and assistance.

Printing inks contain vegetable oils,
paper is recyclable
 1999 Andreas Stihl AG & Co., Waiblingen
0458 326 3021. M10. E9. T. Printed in Germany

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1
3

5
6

8
9
10
11

12
13

326BA038 KN

14
15

1=
2=
3=
4=
5=
6=
7=
8=
9=

Slide control
Handle
Throttle trigger
Intake screen
Clamp
Blower tube
Nozzle
Spark plug boot
Fuel pump

10 = Choke lever
11 = Filter housing
12 = Carburetor adjusting screws
13 = Starter grip
14 = Fuel filler cap
15 = Fuel tank
16 = Muffler

'HILQLWLRQV
6OLGH&RQWURO
Start, run and stop switch.
+DQGOH
The handle of the blower held by the
right hand.

&KRNH/HYHU
Eases engine starting by enriching
mixture.
)LOWHU+RXVLQJ
Covers the air filter element.

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Controls the speed of the engine.

&DUEXUHWRU$GMXVWLQJ6FUHZV
For tuning carburetor

,QWDNH6FUHHQ
Reduces the risk of direct contact
with the fan.

6WDUWHU*ULS
The grip of the pull starter, which is
the device to start the engine.

&ODPS
Secures blower tube to machine.

)XHO)LOOHU&DS
For closing the fuel tank.

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Directs airstream.

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For fuel and oil mixture.

1R]]OH
Aims and widens the airstream
6SDUN3OXJ%RRW
Connects the spark plug to the
ignition wire.

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Attenuates exhaust noises and
diverts exhaust gases away from
operator.

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Provides additional fuel feed for a
cold start.

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Careless or improper use of the machine
may cause serious injury. Have your
STIHL Dealer show you how to operate
your blower. Observe all applicable
local safety regulations, standards and
ordinances.

:DUQLQJ
Minors should never be allowed to use a
blower : Bystanders, especially children,
and animals should not be allowed in the
area where a machine is in use.
Never let the unit run unattended.
Do not lend or rent your machine without
the owner‘s manual. Be sure that anyone using your unit understands the
information contained in this manual.
Most of these safety precautions and
warnings apply to the use of all STIHL
blowers. Different models may have
different parts and controls.

See the appropriate section of your
owner‘s manual for a description of the
controls and function of the parts of your
machine.
6DIHXVHRIDEORZHULQYROYHV
1. the operator
2. the blower
3. the use of the blower .
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You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate a
blower when you are fatigued .
Be alert - if you get tired while operating
your machine, take a break. Tiredness
may result in loss of control. Working
with any blower can be strenuous. If you
have any condition that might be aggravated by strenuous work, check with your
doctor before operating the machine.

:DUQLQJ

Prolonged use of a blower, (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud‘s phenomenon)or
carpal tunnel syndrome. These conditions reduce the hand‘s ability to feel
and regulate temperature, produce
numbness and burning sensations and
may cause nerve and circulation
damage and tissue necrosis.

:DUQLQJ

The STIHL blower is not equipped with
an antivibration (AV) system. Other
STIHL blower models are available with
an AV system designed to reduce the
transmission of engine vibrations to the
operator’s hands. An AV system is
recommended for those operators who
use blowers on a regular or sustained
basis.
Antivibration systems do not guarantee
that you will not sustain whitefinger
disease or carpal tunnel syndrome.
Therefore, continual and regular users
should monitor closely the condition of
their hands and fingers. If any of the
above symptoms appear, seek medical
advice immediately.
3URSHU&ORWKLQJ
Clothing must be sturdy and snug-fitting,
but allow complete freedom of movement.

:DUQLQJ

Avoid loose-fitting jackets, flared or
cuffed pants, scarfs, unconfined long
hair or anything that could be drawn into
the air intake.
Wear overalls or long
pants to protect your legs.
Do not wear shorts.

Use of gloves when
working with the blower is
recommended.

Good footing is most
important. Wear sturdy
shoes with nonslip soles.

:DUQLQJ
To reduce the risk of injury associated
with the inhalation of dust, use a face
filter mask when using your blower in
dusty conditions.

:DUQLQJ
Proper eye protection is a must. Even
though the discharge is directed away
from the operator, ricochets and bounce
backs can occur during blower
operations.
Never operate a blower
unless wearing goggles
or properly fitted safety
glasses with adequate
top and side protection
which comply with ANSI Z 87.1 (or your
applicable national standard).

:DUQLQJ

Blower noise may damage your hearing.
Wear sound barriers (ear plugs or ear
mufflers) to protect your hearing. Continual and regular users should have their
hearing checked regulary.

7+(%/2:(5
For illustrations and definitions of the
blower parts see the chapter on "Parts
and Controls"!

:DUQLQJ

Never modify a blower in any way. Only
attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL blower models
are authorized. Although certain
unauthorized attachment are useable for
the STIHL blower, their use may be
extremely dangerous.
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Always turn off the engine before putting
down blower. When transporting your
unit in a vehicle, properly secure it to
prevent turnover, fuel spillage and
damage to the machine.
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This STIHL unit uses an oil-gasoline
mixture for fuel (see the chapter on
"Fuel" of your owner‘s manual).

:DUQLQJ

Gasoline is an extremely
flammable fuel. If spilled
or ignited by a spark or
other ignition source, it
can cause fire and
serious burn injury or property damage.

Use extreme caution when handling
gasoline or fuel mix.
Do not smoke or bring any fire or flame
near the fuel.
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Fuel your machine in well-ventilated
areas, outdoors only. Always shut off the
engine and allow it to cool before refueling. Relieve fuel tank pressure by loosening fuel cap slowly. Never remove fuel
filler cap while engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine.
Wipe off any spilled fuel before starting
your blower and check for leakage.
Always tighten fuel filler cap securely
after fueling.

:DUQLQJ

Check for fuel leakage while refueling
and during operation. If fuel or oil
leakage is found, do not start or run the
engine until leak is fixed and spilled fuel
has been wiped away. Take care not to
get fuel on your clothing. If this happens,
change your clothing immediately.
Always store gasoline in approved
container.

:DUQLQJ

Unit vibrations can cause an improperly
tightened fuel cap to loosen or come off
and spill quantities of fuel.
In order to reduce risk of
fuel spillage and fire,
tighten fuel cap by hand
with as much force as
possible.
6WDUWLQJ
You should always inspect your unit
before starting it. Make sure the controls
and safety devices are working properly.

Failure to follow this procedure may
result in injury to hand or fingers and
may damage the starter mechanism.

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DGMXVWPHQWV

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Never operate your machine if it is
damaged, improperly adjusted or not
completely and securely assembled.

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Start and operate your unit outdoors in a
ventilated area.

:DUQLQJ
Your blower is a one-person machine.
To reduce the risk of eye or other injury
from thrown objects, insure that bystanders are at least 50 feet (15m) away
during use.
Stop the engine immediately if you are
approached.

Keep the space behind and beside the
engine clear at all times to allow for the
escape of hot and toxic exhaust fumes.
When working with a handheld blower,
always carry it with the muffler away
from you to reduce the risk of burns from
contact with the hot muffler or hot
exhaust fumes.

For specific starting instructions, see the
appropriate section of your owner‘s
manual. Place the machine on firm
ground or other solid surface in an open
area. Maintain good balance and secure
footing.

Operate your machine under good
visibility and daylight conditions only.
Work carefully.

:DUQLQJ
When you pull the starter grip, don‘t
wrap the starter rope around your hand.
Do not allow the grip to snap back, but
guide the starter rope slowly back to
permit the rope to rewind properly.

Operate the blower under good visibility
and daylight conditions only.

Your blower produces
poisonous exhaust fumes
as soon as the combustible engine is running.
These gases (e.g. carbon
monoxide) may be colorless and odorless.
To reduce the risk of serious or fatal
injury from breathing toxic fumes, never
run the blower indoors or in poorly
ventilated locations. Ensure proper
ventilation when working in trenches or
other confined areas.

:DUQLQJ

Use of this product can generate dust,
mists, and fumes containing chemicals
known to cause respiratory disease,
cancer, birth defects, or other reproductive harm. If you are unfamiliar with the
risks associated with the particular dust,
mists or fumes at issue, consult your
employer, governmental agencies such
as OSHA and NIOSH and other sources
on hazardous materials. If the substance
being blown or vacuumed is a commercial substance, review the material
safety data sheet for that substance and
/ or consult the material manufacturer /
supplier. The state of California and
some other authorities, for instance,

Control dust, mist and fumes at the
source where possible. In this regard
use good work practices and follow the
recommendations of OSHA / NIOSH
and occupational and trade associations. When the inhalation of toxic dust,
mists and fumes cannot be eliminated,
the operator and any bystanders should
always wear a respirator approved by
NIOSH / MSHA for the substance at
issue.

:DUQLQJ
Dust with silica in its composition may
contain crystalline silica. Silica is a basic
component of sand, quartz, brick, clay,
granite and numerous other minerals
and rocks, including masonry and concrete products. Repeated and / or substantial inhalation of airborne crystalline
silica can cause serious or fatal respiratory disease, including silicosis. In addition, the state of California and some
other authorities have listed respirable
crystalline silica as a substance known
to cause cancer. When encountering
such materials, always follow the respiratory precautions mentioned above.

:DUQLQJ

Breathing asbestos dust is dangerous
and can cause severe or fatal injury, respiratory illness or cancer. The use and
disposal of asbestos containing products
have been strictly regulated by OSHA
and the Environmental Protection
Agency. Do not blow or disturb asbestos
or asbestos containing products, such
as asbestos insulation. If you have any
reason to believe that you might be
disturbing asbestos, immediately contact
your employer or a local OSHA
representative.
When working with the blower, always
wrap your fingers tightly around the
handle, keeping the control handle
cradled between your thumb and
forefinger. Keep your hand in this
position to have your machine under
control at all times. Make sure your
control handle (and grip for vacuum
attachment) are in good condition and
free of moisture, pitch, oil or grease.

326BA000 LA

have published lists of substances
known to cause cancer, reproductive
toxicity, etc.

:DUQLQJ

To reduce the risk of personal injury, do
not direct air blast towards bystanders,
since the high pressure of the air flow
could injure eyes and could blow small
objects at great speed.

:DUQLQJ

Always shut off the engine before
cleaning or servicing the unit or
replacing parts.
The blower fan between the air intake
and output openings rotates whenever
the engine is running. In order to reduce
the risk of injury from contact with the
fan, never operate your unit without a
properly mounted intake screen and
blower tube. Never insert any foreign
object into the air intake or output
openings of the machine.
Pay attention to the direction of the wind,
i.e., do not work against the wind.

:DUQLQJ

To reduce the risk of personal injury from fire and explosion, never attempt to
pick up hot or burning substances (e.g. smoldering
ashes, glowing cigarettes)
or combustible fluids (e.g.
gasoline, paint thinners).

326BA002 LÄ

:DUQLQJ

In order to reduce the risk of injury from
contact with rotating parts and damage
to the motor, the intake screen must
always be screwed in place when the
suction tube is not mounted.

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Use only identical STIHL replacement
parts for maintenance and repair.
Use of parts manufactured by others
may cause serious or fatal injury.

To reduce the risk of stumbling and loss
of control,do not walk backward while
operating the machine.

Follow the maintenance and repair
instructions in the appropriate section of
your owner’s manual. Refer to the
maintenance chart at the last pages of
this manual.

8VLQJWKH9DFXXP$WWDFKPHQW
(special accessory)

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For specific assembling instructions, see
the appropriate section of your owner’s
manual.
When working with the vacuum attachment (special accessory), always hold
the unit firmly with both hands.
Wear it with the carrying harness over
the shoulder (see illustration).

Always stop the engine and make sure
that the fan is stopped before doing any
maintenance or repair work or cleaning
the blower. Do not attempt any maintenance or repair work not described in
your owner’s manual. Have such work
performed at your STIHL service shop
only.
Check fuel filler cap for leaks at regular
intervals. Use the specified spark plug
and make sure it and the ignition lead
are always in good condition.

:DUQLQJ
A worn or damaged muffler is a fire
hazard and may cause loss of hearing.
Check to see that the muffler is in good
condition. The blower must not be operated if the muffler is not functioning properly or has been removed.
Remember that the risk of forest fires is
greater in hot weather. Use the spark
arresting muffler supplied with the unit.
Never touch a hot muffler or burn will
result.

:DUQLQJ
In order to reduce the risk of fire, do not
modify or remove any part of the muffler
or spark arrestor.
Keep spark plug and wire connection
tight and clean. The spark plug electrode
gap should be checked with a feeler
gauge at least every 50 operating hours
and reset if necessary. Fit a new spark
plug if the electrodes are badly pitted.
For any maintenance please refer to the
maintenance chart DQGWRWKHZDUUDQW\
VWDWHPHQW near the end of this manual.
Store blower in a dry, high or locked
location place and out of reach of
children.
Before storing for longer than a few
days, always empty the fuel tank.

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7
9

2
8

1
13

The BG 75 comes standard as a blower.
A vacuum attachment* is available for
user installation which can be used to
pick up leaves, grass and similar
materials.
%ORZHU

•
•

Line up the dots on the tube and
housing and then push the blower
tube onto the housing stub .
Tighten down the clamp .

* Special accessory

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9DFXXPDWWDFKPHQW

Before using the vacuum attachment for
the first time:
Fit the elbow inside the catcher bag.

•
•

•

It is necessary to remove the blower
tube and fit the elbow with catcher bag
in its place.

•
•

Release the clamp.
Pull the blower tube off the fan housing stub.

•
•
•
•
•

326BA037 KN

5
326BA036 KN

326BA035 KN

Remove the screws from the
starter cover.
Mount the handle - insert the
screws (M5x25) in the starter cover
and one screw (P6x19) at the
underside of the unit and tighten
down.
Remove screw from intake
screen - fold the screen down.
Push suction tube
over intake on fan housing.
Fit the hose clamp and tighten
it down.
Fit elbow of catcher bag on the
fan housing stub .
Attach the carrying strap .
%*

)XHO0L[

)XHOLQJ

This engine is certified to operate on
unleaded gasoline and with the
mix ratio 50:1.

We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.

Your two-stroke engine requires a
mixture of brand-name gasoline and
quality two-stroke engine oil with the
classification TC.

Do not use BIA or TCW (two-stroke
water cooled) mix oils!

The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines etc.), but magnesium castings as
well. This could cause running problems
or even damage the engine. For this
reason it is essential that you use only
name branded fuels!
Use only STIHL two-stroke engine oil or
equivalent branded two-stroke aircooled engine oils with the classification
TC for mixing.

The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
389BA031 KN

Use regular branded unleaded gasoline
with a minimum octane rating of
90 RON (U.S.A./Canada: pump octane
min. 89!). If the octane number of the
regular grade gasoline in your area is
lower use premium unleaded fuel.
Fuel with a lower octane rating may
result in preignition (causing "pinging")
which is accompanied by an increase in
engine temperature. This, in turn,
increases the risk of the piston seizure
and damage to the engine.

Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.

The fuel tank and the canister in which
fuel mix is stored should be cleaned
from time to time.
)XHOPL[DJHV
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
Gasoline

Oil (STIHL 50:1 or
equivalent branded TC oils)

US gal.

US fl.oz

1
2 1/2
5

2.6
6.4
12.8

Before fueling, clean the filler cap
and the area around it to ensure that no
dirt falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your machine.

:DUQLQJ

In order to reduce the risk of burns or
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap carefully so as to allow any pressure
build-up in the tank to release slowly.

:DUQLQJ

After fueling, tighten fuel cap
as securely as possible by hand.

Dispose empty mixing-oil canisters only
at authorized disposal locations.
%*

Change the fuel pick up body every year.

•

Before storing your machine for a long
period, drain and clean the fuel tank and
run engine until carburetor is dry.

Observe safety precautions - see
chapter "Safety Precautions" in this
manual.
To start the engine, move the
slide control to
position.
Squeeze the throttle trigger and
move the slide control to P
at the same time.

•
•

326BA011 LÄ

326BA010 LÄ

389BA032 KN

6WDUWLQJ

Set the choke lever :
for cold start to J
for warm start to H
(even if engine has been
running but is still cold)
Press the fuel pump bulb
at least five times.

Let go of throttle trigger.
Release the slide control =
VWDUWLQJWKURWWOHSRVLWLRQ

When engine begins to fire:

326BA012 LÄ

•

•
•
•

•

Put the unit on the ground.
Make sure you have a firm footing:
Hold the unit with your left hand and
press it firmly against the ground.
Pull the starter grip slowly with your
right hand until you feel it engage and then give it a brisk strong pull.
Do not pull out starter rope more
than 30" (75 cm) - it might break.
Do not let the starter grip snap back.
Guide it back slowly so that starter
rope can rewind properly.

•
•
•

Move choke lever to H
and continue cranking.
$VVRRQDVHQJLQHUXQVblip the
throttle trigger, the slide
control then moves to the
"Run" position
and the returns to idling speed.
To shut down the engine:
Move the slide control to .
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$OORZHQJLQHWRZDUPXS.
As soon as engine runs:
Blip the throttle trigger =
slide control moves to the
"Run" position
engine returns to idling speed.
Open throttle slightly - warm up
engine for short period.
,IWKHHQJLQHGRHVQ¶WVWDUW
If you did not move the choke
lever to H
quickly enough after the engine
began to fire, the combustion
chamber hasflooded.

326BA013 LÄ

•

Remove spark plug terminal .

•
•
•
•
•
•
•
•

Unscrew and dry off the
spark plug.
Set slide control to "0".
Engage the throttle fully.
Pull the starter rope several
times to clear the combustion
chamber.
Refit the spark plug and connect
the spark plug terminal.
Set slide control to
Set choke lever to H
even if engine is cold.
Now start the engine.

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Press fuel pump bulb
at least 5 times.

•

Now start the engine.

326BA004 LÄ

326BA014 LÄ

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The blower is designed for singlehanded operation. The operator can grip
the handle on the housing in his right or
left hand.

The blower’s wide nozzle is particularly
effective for clearing large areas covered
with sawdust, fallen leaves or cut
grass etc.

A large area can be covered with the
wide nozzle.

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FKHGRIIFRPSOHWHO\EHIRUHXQGHU
WDNLQJDQ\DOWHUDWLRQV (risk of injury
due to the circulating fan wheel).

The wide nozzle generates a flat airstream which can be used highly specifically and effectively since the outlet is
near ground level.

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XSFRUUHFWO\

:DUQLQJ
Be wary of small animals when blowsweeping or vaccuming leaves. To avoid
possible injuries in such situations, do
not run the unit at high revs.

To minimize blowing time, use rakes
and brooms to loosen debris before
blowing.
Recommended working techniques to
minimize airborne debris and pollution:

•
•

326BA002 LÄ

•

When using the blower as a vacuum
cleaner (vacuum attachment as special
accessory), the carrying strap on the
catcher bag is placed over the left
shoulder and the right arm is guided by
the carrying strap. The left hand grips
the handle on the housing, the right
hand gripping the carrying handle.

•

Use the full blower nozzle
extension so the air stream can
work close to the ground.
Do not direct debris at subjects
such as open windows or freshlywashed cars.

•
•

Operate power blowers at the
lowest possible throttle speed to do
the job.
Check your equipment before
operation, especially the muffler, air
intakes and air filters.

Conserve water by using power blowers
instead of hoses for those lawn and
garden applications where a blower can
be properly used, such as cleaning
patios or porches.

After using blowers, clean up. Do
not blow debris onto neighbouring
properties.

Recommended working techniques to
minimize noise:

•

Large leaves, cardboard or pieces of
bark can be taken up by the suction
tube with its large diameter.

Never take up wet leaves as they may
clog the fan!

•
%*

In dusty conditions, slightly dampen
surfaces.

power equipment at a time, when
possible.

Operate power equipment only at
reasonable hours - not early in the
morning, late at night or during the
noon-break when people might be
disturbed. Comply with times listed
in local ordinances. Usual recommendations are 9:00 a.m. to 12:00
a.m. and 03:00 p.m. to 5:00 p.m. on
workdays for professionals. Special
considerations should be given to
neighbours on weekends.
Fewer engines mean less noise;
therefore use only one piece of

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355BA031 KN

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2
3

0RWRU0DQDJHPHQW

4
326BA015 KN

Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
,IWKHUHLVDQRWLFHDEOHORVVRIHQJLQH
SRZHU

•
•

Move choke lever to J
Press in the tab .
Ease the filter cover
over the tab and lift it off.
Clean away loose dirt from around
the filter.

•
•
•

355BA032 KN

Remove the foam and felt
filter elements.
Wash the foam element in a clean,
non-flammable cleaning solution
(e.g. warm soapy water) and then
dry.
Fit a new felt filter element. As a
temporary measure you can knock
it out on the palm of your hand or
blow it out with compressed air.
Don’t wash.

Always replace damaged filter elements.
Install the foam element in the
filter cover
Place felt element (lettering
facing inward) in filter housing .
Fit the felt cover so that it snaps
into position.

•
•
•

Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components
(e.g. carburetion, ignition, timing and
valve or port timing) without the addition
of any major hardware.
The carburetor comes with a standard
setting.
This is the optimum setting to ensure
your machine will operate reliably
with the lowest possible emissions
under most operating conditions.
6WDQGDUGVHWWLQJ
If it is necessary to readjust the carburetor from scratch, first carry out the
standard setting.
Turn
+ high speed adjusting screw and
/ low speed adjusting screw counterclockwise (richer) as far as stop.
Check air filter and clean it if necessary.
Warm up the engine.
Set idle speed correctly.

•
•
•

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DGMXVWLQJVFUHZ

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LQ0XIIOHU

326BA031 KN

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Carry out the standard setting.
Turn the idle speed adjusting screw /$
clockwise until the engine runs smoothly.

2
326BA025 KN

326BA018 LÄ

Your carburetor does not have a high
speed adjusting screw (H screw). Adjustment of maximum engine speed is not
necessary.
The carburetor is set at the factory to
guarantee an optimum fuel-air mixture
under all operating conditions.
Idling and part-load emissions are minimized by limiting the idle mixture.

•
•
•

Check the air filter and clean it if
necessary.
Warm up the engine.
Carefully screw the low speed
screw / down onto its seat. Then
open it one turn counterclockwise
(standard setting, / )

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Check standard setting.
(L screw must be one turn open)

326BA024 KN

If the engine is down on power, check
the spark arresting screen in the muffler.

•
•
•
•
•

Remove the housing
Take out the screw.
Take out the spark arresting
screen .
Clean the spark arresting screen.
If screen is damaged or heavily
carbonized, fit a new one.
Install the spark arresting screen.
Mount the housing.

Turn the idle speed screw /$ clockwise until the engine runs smoothly.
%*

000BA039 KN

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Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.

•
•
•
•

Remove spark plug see chapter “Starting”:
Clean dirty spark plug.
Check electrode gap it should be 0.5mm/0.02" $ readjust if necessary.
Use only resistor type spark plugs
of the approved range.

Rectify problems which have caused
fouling of spark plug:
Incorrect carburetor setting, too much oil
in fuel mix, dirty air filter,
unfavorable running conditions, e.g.
operating at part load.

000BA036 TR

If engine is down on power, difficult to
start or runs poorly at idling speed,
first check the spark plug.

•

Fit a new spark plug after
approx. 100 operating hours or earlier if the electrodes are
badly eroded.

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To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL (see “Specifications”). Always
press spark plug boot snugly onto
spark plug terminal of the proper
size. (Note: If terminal has detachable
SAE adapter nut, it must be attached.)
A loose connection between spark plug
terminal and ignition wire connector in
the boot may create arcing that could
ignite combustible fumes and cause a
fire.
%*

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2
4

•

Slacken off the housing screws.
Remove the three screws .
Lift the starter cover off
the engine
(if vac attachment is fitted, remove
handle before starter cover)

326BA027 KN

326BA026 KN

326BA029 KN

•

Take out the screw .
Remove the rope rotor very
carefully - the rewind spring is
seated in the rope rotor
and may pop out, uncoil and
cause injury if care is not taken.
Release spring tension by pulling
starter handle out serval inches.
Hold pulley to prevent rebound.
Pull rope. Slowly release spring
tension by allowing pulley to unwind
until all tension is gone.

•
•
•
•

Use a screwdriver to ease the cap
out of the starter grip.
Remove remaining rope from the
rotor and grip, making sure the
ElastoStart sleeve is not pushed
out of the grip.
Tie a simple overhand knot in the
end of the new starter rope and
then thread rope through the top of
the grip and the rope bush .
Refit the cap in the grip.

Pull the rope through the rotor and
secure it with a simple overhand
knot.

•
•
•

Lubricate rope rotor bore with
non-resinous oil.
Push rotor onto the starter post turn back and forth until loop of
rewind spring engages.
Insert screw and tighten down
securely.

355BA021 KN

355BA020

326BA028 KN

•

7HQVLRQLQJUHZLQGVSULQJ
Make a loop in the starter rope
and use it to turn the rope rotor
six full revolutions counterclockwise.
Hold the rotor steady straighten the twisted rope release the rotor let go of rope slowly so that it
winds onto the rotor.

•

The starter grip must be firmly
seated in the rope guide bush.
If grip droops to one side:
Add one more turn on rope rotor
to increase spring tension.

2SHUDWLQJ,QVWUXFWLRQV

•
•

'XULQJEUHDNLQSHULRG

When starter rope is fully extended,
it must be possible to rotate the rotor
another one half turn.
If this is not the case,
the spring is overtensioned and
could break.
Take one turn of rope off the
rotor.
Secure the starter cover.
Tighten down the housing screws
firmly.

A factory new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period.
As all moving parts have to bed in
during the break-in period, the
frictional resistances in the engine
are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.

•

Lubricate the new spring with a
few drops of non-resinous oil do not open the wire retainer.

a = 2mm
(0.08in)

•
•
•

•
•
•
•
%*

Remove the rope rotor.
Remove parts of old spring.
Fit the new spring position outer spring loop in the
recess - the wire retainer
slips off in this process.

355BA022 KN

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'XULQJRSHUDWLRQ
After a long period of full-throttle
operation, allow engine to run for a while
at idle speed so that the heat in the
engine can be dissipated by flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
$IWHUILQLVKLQJZRUN

If the spring pops out and uncoils:
Refit it in the counterclockwise
direction start outside and work
inward.

Storing for a short period:
Wait for engine to cool down. To avoid
condensation, fill the fuell tank and
keep the unit in a dry place until you
need it again.

Install the rope rotor.
Tension the rewind spring.
Fit the starter cover.
Tighten down the housing screws
firmly.

Storing for an long period:
see chapter "Storing the Machine".

Complete machine
Control handle
Air filter
Filter in fuel tank
Fuel tank
Carburetor
Spark plug
Cylinder fins
Spark arresting screen in muffler
All accessible screws and nuts
(not adjusting screws)

The user of this unit should carry out
only the maintenance operations
described in this manual. Other repair
work may be performed only by an
authorized STIHL Service dealer.

Visual inspection (condition, leaks)
Clean
Check operation
Clean
Replace
Check
Replace felt and strainer
Clean
Check idle adjustment
Idle setting
Readjust electrode gap
Clean
Inspect
Clean or replace
Retighten

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KDVEHHQSHUIRUPHGE\DQDXWKRUL]HG
67,+/6HUYLFHGHDOHUXVLQJRULJLQDO
67,+/VSDUHSDUWV

see page:

as required

if damaged

if faulty

monthly

weekly

after each
refueling stop

after finishiing
work or daily

Please note that the following maintenance intervals apply for normal operating
conditions only. If your daily working time is longer than normal or operating
conditions are difficult (very dusty work area) shorten the specified intervals
accordingly.

before
starting work

0DLQWHQDQFH&KDUW

x
x

x
x
x
x
x
x

x
x
x

11
15
15
11
11
11
15-16
15-16
17

x
x

16
16

x
x

Original STIHL parts can be identified
by the STlHL part number, the
T logo and the STIHL parts
symbol The symbol may appear
alone on small parts.

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Single cylinder two-stroke engine

Carburetor:

Displacement:
Bore:
Stroke:

1.55 cu.in
(25.4 cm3)
(1.34 in) 34 mm
(1.10 in) 28 mm

Engine power:

0.75 kW (1.00 HP)

Fuel tank capacity:
Fuel mixture:

See "Adjusting the
Carburetor"

Weight:

Max. permissible
engine speed:

Idle speed:

640 m3/h (377 cfm)
60 m/s (198 ft/s)

,JQLWLRQ6\VWHP
Electronic
(breakerless)
magneto ignition

park plug
(suppressed):

Bosch WSR 6 F
or
NGK BPMR 7 A;
0.02 in (0.5 mm)
M 14 x 1.25;
0.37 in (9.5 mm)
long

•
•
•
•
•

Remove the blower tube and
nozzle.
Drain and clean the fuel tank.
Run engine until carburetor is dry this helps prevent the carburetor
diaphragms sticking together.
Thoroughly clean the machine pay special attention to the
cylinder fins and air filter.
Store the machine in a dry, high
or locked location - out of the
reach of children and other
unauthorized persons.

6SHFLDO$FFHVVRULHV
Vacuum attachment kit:
4227 007 1000
Gutter cleaning kit:
4227 007 1005

Type:

Electrode gap:
Spark plug thread:

All position
diaphragm
carburetor
with integral fuel
pump
Foam and felt
elements
0.9 US pt (0.5 L)
See chapter
"Fuel Mix"
(complete unit
w/out tools)
9.4 lb (4.3 kg)

2,800 r.p.m.

Bystanders noise per
ANSI B 175.2-1990 69 dB (A)
Air flow rate
Air velocity

Air filter:

For periods of about 3 months or longer:

67,+/,QFRUSRUDWHG)HGHUDODQG&DOLIRUQLD
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Source Exif Data:
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Encryption : Standard V1.2 (40-bit)
User Access : Print, Fill forms, Extract, Assemble, Print high-res
Create Date : 2000:06:21 11:46:22Z
Modify Date : 2005:02:18 12:52:07-05:00
Subject : Gebrauchsanleitung
Page Count : 27
Creation Date : 2000:06:21 11:46:22Z
Producer : Acrobat Distiller 4.0 for Windows
Mod Date : 2004:11:03 07:54:58+01:00
Author : D1/MTG-fi
Metadata Date : 2004:11:03 07:54:58+01:00
Title : STIHL BG 75
Description : Gebrauchsanleitung
Creator : D1/MTG-fi

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Stihl Bg75 Manual BG 75

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