Harbor Freight 8 Hp 301Cc Ohv Horizontal Shaft Gas Engine Epa Product Manual

2015-05-27

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Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,

operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual near the assembly diagram (or month and year of purchase if product has no number).
Keep this manual and the receipt in a safe and dry place for future reference.

REV 15a

301cc

Horizontal Engine

Using an engine indoors
CAN KILL YOU IN MINUTES.
Engine exhaust contains carbon monoxide.
This is a poison you cannot see or smell.

301

INE
NG
EE
OLIN
GAS
415
1

:6
ITEM

NEVER use inside
a home or garage,
EVEN IF doors and
windows are open.

Only use OUTSIDE
and far away from
windows, doors,
and vents.

Visit our website at: http://www.harborfreight.com
Email our technical support at: predator@harborfreight.com

ITEM 61415

When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright© 2013 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
Tools required for assembly and service may not be included.

Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Table of Contents
Specifications.............................................. 2
Safety��������������������������������������������������������� 3
Setup........................................................... 6
Operationr���������������������������������������������������� 8

Maintenances���������������������������������������������� 12
Troubleshooting.......................................... 16
Warranties.................................................. 18
Parts Lists and Diagrams........................... 20

Specifications
Displacement
Engine Type
Cooling System
Type

Fuel

Capacity

Engine Oil

Type SAE

Capacity
Run Time @ 50% Load
with full tank
Sound Level
Bore x Stroke
Compression Ratio
Rotation viewed from PTO
(power takeoff - the output shaft)

Spark Plug
Valve Clearance
Speed
Shaft

301cc
Horizontal Single Cylinder
4-stroke OHV
Forced air cooled
87+ octane stabilizer treated
unleaded gasoline
1.72 Gallon
10W-30 above 32° F
5W30 at 32° F or below
1 Quart
3 hr.
106 dB
80 mm x 60 mm
8:1
Counterclockwise

Type
Gap
Intake
Exhaust
Idle

DK7RTC
0.7 - 0.8 mm
0.15 ±0.02 mm
0.20 ±0.02 mm
1950 ±50 RPM

Shaft

Ø1″ x 3.48″

Keyway

0.25″

End Tapped

7/16″ - 20 UNF

The emissions control system for this Engine is warranted for standards set by the
U.S. Environmental Protection Agency. For warranty information, refer to the last pages of this manual.

Page 2

For technical questions, please call 1-888-866-5797.

ITEM 61415

WARNING SYMBOLS AND DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that
follow this symbol to avoid possible injury or death.

Safety

Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.

Addresses practices not related to personal injury.

RPM
HP

Property or Statement
Revolutions Per Minute
Horsepower
WARNING marking concerning
Risk of Eye Injury. Wear ANSI-approved
safety goggles with side shields.
Read the manual before
set-up and/or use.
WARNING marking concerning
Risk of Hearing Loss.
Wear hearing protection.

Symbol

Property or Statement

WARNING marking concerning
Risk of Respiratory Injury.
Operate engine OUTSIDE and far away
from windows, doors, and vents.
WARNING marking concerning
Risk of Fire while handling fuel.
Do not smoke while handling fuel.
WARNING marking concerning
Risk of Fire.
Do not refuel while operating.
Keep flammable objects
away from engine.

IMPORTANT SAFETY INSTRUCTIONS

Operation

Symbol

Setup

Symbol Definitions

WARNING! Read all instructions.
Failure to follow all instructions listed below may result in fire, serious injury and/or DEATH.
The warnings and precautions discussed in this manual cannot cover all possible conditions and
situations that may occur. It must be understood by the operator that common sense and caution
are factors which cannot be built into this product, but must be supplied by the operator.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Maintenance

SAVE THESE INSTRUCTIONS

Page 3

Set up Precautions

Safety

1. Gasoline fuel and fumes are flammable, and
potentially explosive. Use proper fuel storage
and handling procedures. Do not store fuel
or other flammable materials nearby.

4. Set up and use only on a flat, level,
well‑ventilated surface.

2. Have multiple ABC class fire extinguishers nearby.

6. Use only lubricants and fuel recommended
in the Specifications chart of this manual.

3. Operation of this equipment may create sparks that
can start fires around dry vegetation.
A spark arrestor may be required. The operator
should contact local fire agencies for laws or
regulations relating to fire prevention requirements.

5. Wear ANSI-approved safety goggles, heavy-duty
work gloves, and dust mask/respirator during set up.

Operating Precautions
CARBON MONOXIDE HAZARD
Using an engine indoors
CAN KILL YOU IN MINUTES.
Engine exhaust contains
carbon monoxide. This is a poison
you cannot see or smell.

9. Industrial applications must follow
OSHA requirements.

Setup

10. Do not leave the engine unattended when it is
running. Turn off the engine (and remove safety
keys, if available) before leaving the work area.
11. The engine can produce high noise levels.
Prolonged exposure to noise levels
above 85 dBA is hazardous to hearing.
Wear ear protection when operating the engine
or when working nearby while it is operating.
12. Wear ANSI-approved safety glasses
and hearing protection during use.

NEVER use inside a home or garage,
EVEN IF doors and windows are open.

Operation

Only use OUTSIDE and far away from windows,
doors, and vents.
2. Keep children away from the equipment,
especially while it is operating.

13. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to a heart pacemaker could cause
pacemaker interference or pacemaker failure.
Caution is necessary when near the
engine’s magneto or recoil starter.
14. Use only accessories that are recommended
by Harbor Freight Tools for your model.
Accessories that may be suitable for one
piece of equipment may become hazardous
when used on another piece of equipment.

Maintenance

3. Keep all spectators at least six feet
from the Engine during operation.

15. Do not operate in explosive atmospheres,
such as in the presence of flammable
liquids, gases, or dust. Gasoline-powered
engines may ignite the dust or fumes.

4. Fire Hazard! Do not fill gas tank while engine is
running. Do not operate if gasoline has been spilled.
Clean spilled gasoline before starting engine.
Do not operate near pilot light or open flame.

16. Stay alert, watch what you are doing and
use common sense when operating this
engine. Do not use while tired or under the
influence of drugs, alcohol or medication.

5. Do not touch engine during use.
Let engine cool down after use.

17. Dress properly. Do not wear loose clothing or
jewelry. Keep hair, clothing and gloves away
from moving parts. Loose clothes, jewelry or
long hair can be caught in moving parts.

6. Never store fuel or other flammable
materials near the engine.
7. Only use a suitable means of transport and
lifting devices with sufficient weight bearing
capacity when transporting the engine.
8. Secure the engine on transport vehicles to
prevent it from rolling, slipping, and tilting.

Page 4

18. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
19. Do not cover the engine during operation.
20. Keep the engine and surrounding
area clean at all times.

For technical questions, please call 1-888-866-5797.

ITEM 61415

21. Use the equipment, accessories, etc., in
accordance with these instructions and in the
manner intended for the particular type of
equipment, taking into account the working
conditions and the work to be performed.
Use of the equipment for operations different from
those intended could result in a hazardous situation.
22. Do not operate the equipment with known
leaks in the engine’s fuel system.
23. WARNING: This product contains or, when
used, produces a chemical known to the State
of California to cause cancer and birth defects
or other reproductive harm. (California Health
& Safety Code § 25249.5, et seq.)

24. When spills of fuel or oil occur, they must be
cleaned up immediately. Dispose of fluids and
cleaning materials as per any local, state, or
federal codes and regulations. Store oil rags in
a bottom-ventilated, covered, metal container.
25. Keep hands and feet away from moving parts.
Do not reach over or across
equipment while operating.

Safety

Operating Precautions (cont.)

26. Before use, check for misalignment or binding of
moving parts, breakage of parts, and any other
condition that may affect the equipment’s operation.
If damaged, have the equipment serviced
before using. Many accidents are caused
by poorly maintained equipment.

Service Precautions
b. Allow the engine to completely cool.
c. Then, remove the spark plug cap
from the spark plug.
2. Keep all safety guards in place and in
proper working order. Safety guards include
muffler, air cleaner, mechanical guards,
and heat shields, among other guards.
3. Do not alter or adjust any part of the
equipment or its engine that is sealed by the
manufacturer or distributor. Only a qualified
service technician may adjust parts that may
increase or decrease governed engine speed.
4. Wear ANSI-approved safety goggles,
heavy‑duty work gloves, and
dust mask/respirator during service.
5. Maintain labels and nameplates on the equipment.
These carry important information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.

7. Store equipment out of the reach of children.
8. Follow scheduled engine and
equipment maintenance.

Operation

a. Turn the engine switch to its “OFF” position.

6. Have the equipment serviced by a qualified repair
person using only identical replacement parts.
This will ensure that the safety of the equipment
is maintained. Do not attempt any service or
maintenance procedures not explained in this
manual or any procedures that you are uncertain
about your ability to perform safely or correctly.

Refueling:
1. Do not smoke, or allow sparks, flames,
or other sources of ignition around the
equipment, especially when refuelling.
2. Do not refill the fuel tank while the
engine is running or hot.
3. Do not fill fuel tank to the top.
Leave a little room for the fuel to expand as needed.
Refuel in a well-ventilated area only.
4. Wipe up any spilled fuel and allow excess
to evaporate before starting engine.
To prevent FIRE, do not start the engine
while the smell of fuel hangs in the air.

Maintenance

1. Before service, maintenance, or cleaning:

SAVE THESE INSTRUCTIONS.

ITEM 61415

Setup

27. Use the correct equipment for the application.
Do not modify the equipment and do not use the
equipment for a purpose for which it is not intended.

For technical questions, please call 1-888-866-5797.

Page 5

Set Up
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual
including all text under subheadings therein before set up or use of this product.

Safety

TO PREVENT SERIOUS INJURY:
Operate only with proper spark arrestor installed.
Operation of this equipment may create sparks that can start fires around dry vegetation.
A spark arrestor may be required.
The operator should contact local fire agencies for laws or regulations
relating to fire prevention requirements.
WARNING! DO NOT INSTALL THIS ENGINE ON A VEHICLE.
NOT FOR HIGHWAY USE. FOLLOW ALL APPLICABLE LAWS FOR INSTALLATION AND USE.
WARNING! INSTALL THIS ENGINE ACCORDING TO EQUIPMENT INSTRUCTIONS BEFORE USE.

Components and Controls
Setup

Air Cleaner

Fuel Cap

Operation

Starter
Handle

Muffler

Oil Drain Plug

Maintenance

Throttle

Dipstick

Choke
Fuel Valve
Engine
Switch

Page 6

For technical questions, please call 1-888-866-5797.

ITEM 61415

High Altitude Operation Above 3000 feet

NOTICE Warranty void if necessary adjustments are not made for high altitude use.
At high altitudes, the engine’s carburetor, governor (if so equipped), and any other parts that control the fuel-air
ratio will need to be adjusted by a qualified mechanic to allow efficient high-altitude use and to prevent damage
to the engine and any other devices used with this product. The fuel system on this engine may be influenced by
operation at higher altitudes. Proper operation can be ensured by installing an altitude kit at altitudes higher than
3000 ft. above sea level. At elevations above 8000 ft, the engine may experience decreased performance, even
with the proper main jet. Operating this engine without the proper altitude kit installed may increase the engine’s
emissions and decrease fuel economy and performance. The kit should be installed by a qualified mechanic.

Safety

WARNING! TO PREVENT SERIOUS INJURY FROM FIRE:
Follow instructions in a well-ventilated area away from ignition sources.
If the engine is hot from use, shut the engine off and wait for it to cool before proceeding. Do not smoke.

1. Turn off the engine.
2. Close the fuel valve.
3. Place a bowl under the fuel cup to catch any spilled fuel.
4. Unthread the bolt holding the fuel cup.

Fuel Cup Seal

CAUTION! Carburetor bowl may have gas in it
which will leak upon removing the bolt.

Mixing Tube

(might remain
inside carburetor)

5. Remove the bolt, Bolt Seal, fuel cup, Fuel Cup Seal and
Main Jet from the body of the carburetor assembly.
A carburetor screwdriver (not included) is needed
to remove and install the Main Jet.

Setup

Carburetor
Assembly

Main Jet
Fuel Cup

Note: The mixing tube is held in place by the main jet and
might fall out when it is removed. If it falls out, replace it in
the same orientation before replacing the main jet.
6. Replace the Main Jet with the replacement Main Jet
needed for your altitude range (part 1a or 2a).

Operation

Bolt Seal
Bolt

Note: The Fuel Cup Seal and Bolt Seal may be damaged during removal
and should be replaced with the new ones from the kit.
7. Replace the Fuel Cup Seal (4a), fuel cup, Bolt Seal (3a), and bolt. Tighten in place.
CAUTION: Do not cross thread bolt when tightening.
Finger tighten first and then use a wrench to make sure the bolt is properly threaded.
8. Wipe up any spilled fuel and allow excess to evaporate before starting engine.
To prevent FIRE, do not start the engine while the smell of fuel hangs in the air.

Part
1a
2a
3a
4a

ITEM 61415

Description
Main Jet 3000-6000 ft.
Main Jet 6000-8000 ft.
Bolt Seal
Fuel Cup Seal

Maintenance

High Altitude Kit Parts List - A
Qty
1
1
1
2

For technical questions, please call 1-888-866-5797.

Page 7

Operation
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual
including all text under subheadings therein before set up or use of this product.

Safety

Pre-Start Checks
Inspect engine and equipment looking for damaged, loose, and missing parts before set up and starting.
If any problems are found, do not use equipment until fixed properly.
Checking and Filling Engine Oil

Setup

NOTICE: Your Warranty is VOID if the engine’s
crankcase is not properly filled with oil before
each use. Before each use, check the oil level.
Do not run the engine with low or no engine oil.
Running the engine with no or low engine oil
WILL permanently damage the engine.

Full level

1. Make sure the engine is stopped and is level.
2. Close the Fuel Valve.
3. Clean the top of the Dipstick and the area around it.
Remove the Dipstick by threading
it counterclockwise, and wipe it off
with a clean, lint free rag.

4. Reinsert the Dipstick without threading it in and
remove it to check the oil level. The oil level
should be up to the full level as shown above.

Operation

5. If the oil level is at or below the low mark add the
appropriate type of oil until the oil level is at the
proper level. SAE 10W‑30 oil is recommended
for general use. (The SAE Viscosity Grades chart
on page 13 in the Service section shows other
viscosities to use in different average temperatures.)
6. Thread the dipstick back in clockwise.
NOTICE: Do not run the engine with too little oil.
The engine will be permanently damaged.

Maintenance
Page 8

For technical questions, please call 1-888-866-5797.

ITEM 61415

Checking and Filling Fuel

2. Unscrew and remove the Fuel Cap.
3. If needed, fill the Fuel Tank to about 1 inch
under the fill neck with 87 octane or higher
unleaded gasoline that has been treated with
a fuel stabilizer additive. Follow fuel stabilizer
manufacturer’s recommendations for use.

Note: Do not use gasoline that has been stored in a
metal fuel container or a dirty fuel container. It can
cause particles to enter the carburetor, affecting
engine performance and/or causing damage.
4. Then replace the Fuel Cap.
5. Wipe up any spilled fuel and allow excess
to evaporate before starting engine.
To prevent FIRE, do not start the engine
while the smell of fuel hangs in the air.

Safety

1. Clean the Fuel Cap and the area around it.

Note: Do not use gasoline containing more than
10% ethanol (E10). Do not use E85 ethanol.

Setup

WARNING! TO PREVENT SERIOUS
INJURY FROM FIRE:
Fill the fuel tank in a well-ventilated area
away from ignition sources. If the engine is
hot from use, shut the engine off and wait
for it to cool before adding fuel.
Do not smoke.

Starting the Engine
Before Starting the Engine

Maintenance

Operation

Before starting the engine:
a. Follow the Set Up Instructions in the equipment manual to prepare the equipment.
b. Inspect the equipment and engine.
c. Fill the engine with the proper amount and type of both unleaded gasoline and oil.
d. Read the Equipment Operation section in the equipment manual.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 9

Manual Start

Safety

1. To start a cold engine, move the Choke to the
START position.
To restart a warm engine, leave the Choke in the
RUN position.

STARTRUN

2. Open the Fuel Valve.

Setup

2
OFF

3. Slide the Throttle or Speed Control Lever to 1/3
away from the SLOW position (the “turtle”).
Note: Some tools have a Speed Control Lever located
elsewhere on the tool which functions the same as the
Throttle. Use the Speed Control Lever in place of the
Throttle when the tool is so equipped.

Operation

O
OFF
4. Turn the Engine Switch on.

Maintenance

5. Grip the Starter Handle of the Engine loosely and pull
it slowly several times to allow the gasoline to flow into
the Engine’s carburetor. Then pull the Starter Handle
gently until resistance is felt. Allow Cable to retract fully
and then pull it quickly. Repeat until the engine starts.

ON
I

Note: Do not let the Starter Handle snap back against the engine.
Hold it as it recoils so it doesn't hit the engine.

Page 10

For technical questions, please call 1-888-866-5797.

ITEM 61415

6. Allow the Engine to run for several seconds.
Then, if the Choke lever is in the START position,
move the Choke Lever very slowly to its RUN position.

Safety

Note: Moving the Choke Lever too
fast could stall the engine.
STARTRUN

IMPORTANT: Allow the engine to run at no load for five minutes with no
load after each start‑up so that the engine can stabilize.
7. Adjust the Throttle as needed.

Break-in Period:
a. Breaking-in the engine will help to ensure proper equipment and engine operation.

Setup

b. The operational break-in period will last about 3 hours of use. During this period:
• Do not apply a heavy load to the equipment.
• Do not operate the engine at its maximum speed.
c. The maintenance break-in period will last about 20 hours of use.
• Change the engine oil after this period.
Under normal operating conditions subsequent maintenance follows
the schedule explained in the MAINTENANCE section.

Stopping the Engine

OFF

Operation

1. To stop the engine in an emergency,
turn the Engine Switch off.

2. Under normal conditions, use the following procedure:
a. Slide the Throttle to SLOW (the “turtle”).
b. Turn the Engine Switch off.
c. Close the Fuel Valve.

Maintenance

NOTICE
Drain fuel at end of season
or warranty is void.
See Storage on page 15 for
complete storage instructions.

OFF

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 11

Maintenance

WARNING

Safety

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING:
Turn the Power Switch of the equipment to its “OFF” position, wait for the engine to cool, and disconnect
the spark plug cap before performing any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM EQUIPMENT FAILURE:
Do not use damaged equipment. If abnormal noise, vibration, or excess
smoking occurs, have the problem corrected before further use.
Follow all service instructions in this manual. The engine may fail critically if not serviced properly.
Many maintenance procedures, including any not detailed in this manual, will need to be performed
by a qualified technician for safety. If you have any doubts about your ability to safely service the
equipment or engine, have a qualified technician service the equipment instead.

Cleaning, Maintenance, and Lubrication Schedule
Setup

Note: This maintenance schedule is intended solely as a general guide. If performance decreases or if
equipment operates unusually, check systems immediately. The maintenance needs of each piece of equipment
will differ depending on factors such as duty cycle, temperature, air quality, fuel quality, and other factors.
Note: The following procedures are in addition to the regular checks and maintenance
explained as part of the regular operation of the engine and equipment.
Before
Each Use

Procedure

Monthly or
Every 3 mo. or Every 6 mo. or
every 20
50 hr. of use 100 hr. of use
hr. of use

Yearly or
every 300
hr. of use

Every
2 Years

Brush off outside of engine
Check engine oil level
Check air filter
Check deposit cup

Operation

Change engine oil

Clean/replace air filter
Check and clean spark plug
1. Check/adjust idle speed
2. Check/adjust valve clearance
3. Clean fuel tank, strainer
and carburetor

4. Clean carbon build-up from
combustion chamber
Replace fuel line if necessary

**
**

*Service more frequently when used in dusty areas.
**These items should be serviced by a qualified technician.
Maintenance
Page 12

For technical questions, please call 1-888-866-5797.

ITEM 61415

Checking and Filling Fuel

Engine Oil Change

CAUTION! Oil is very hot during operation and can
cause burns. Wait for engine to cool before changing oil.

1. Clean the Fuel Cap and the area around it.

4. Remove the drain plug and, if possible,
tilt the crankcase slightly to help drain
the oil out. Recycle used oil.

3. If needed, fill the Fuel Tank to about 1 inch
under the fill neck with 87 octane or higher
unleaded gasoline that has been treated with
a fuel stabilizer additive. Follow fuel stabilizer
manufacturer’s recommendations for use.
Note: Do not use gasoline containing more than
10% ethanol (E10). Do not use E85 ethanol.
Note: Do not use gasoline that has been stored in a
metal fuel container or a dirty fuel container. It can
cause particles to enter the carburetor, affecting
engine performance and/or causing damage.

Safety

2. Close the Fuel Valve.
3. Place a drain pan (not included) underneath
the crankcase’s drain plug.

5. Replace the drain plug and tighten it.
6. Clean the top of the Dipstick and the
area around it. Remove the Dipstick by
threading it counterclockwise, and wipe
it off with a clean, lint free rag.

Full level

4. Then replace the Fuel Cap.
5. Wipe up any spilled fuel and allow excess
to evaporate before starting engine.
To prevent FIRE, do not start the engine
while the smell of fuel hangs in the air.

Setup

2. Unscrew and remove the Fuel Cap.

1. Make sure the engine is stopped and is level.

7. Add the appropriate type of oil until the oil level is at
the full level. SAE 10W‑30 oil is recommended for
general use.
The SAE Viscosity Grade chart shows other
viscosities to use in different average temperatures.

SAE Viscosity Grades

Operation

30
10W-30
5W-30
-20

100°F

Average outdoor temperature
8. Thread the dipstick back in clockwise.

Maintenance

NOTICE: Do not run the engine with too little oil.
The engine will be permanently damaged.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 13

Air Filter Element Maintenance
1. Remove the air cleaner cover and
the air filter element(s) and check for
dirt. Clean as described below.
2. Cleaning:

Safety

• For “paper” filter elements:
To prevent injury from dust and debris,
wear ANSI-approved safety goggles,
NIOSH‑approved dust mask/respirator, and
heavy-duty work gloves. In a well‑ventilated
area away from bystanders, use pressurized
air to blow dust out of the air filter.
• For foam filter elements:
Wash the element in warm water and
mild detergent several times. Rinse.
Squeeze out excess water and allow it to dry
completely. Soak the filter in lightweight oil
briefly, then squeeze out the excess oil.

Setup

3. Install the cleaned filter. Secure the
Air Cleaner Cover before use.

Spark Plug Maintenance
Spark
Plug
Cap

1. Disconnect spark plug cap from end of plug.
Clean out debris from around spark plug.
2. Using a spark plug wrench, remove the spark plug.
3. Inspect the spark plug:
If the electrode is oily, clean it using a clean, dry rag.
If the electrode has deposits on it, polish it using
emery paper. If the white insulator is cracked or
chipped, the spark plug needs to be replaced.

Recommended Spark Plugs
NGK®
NHSP® / TORCH®

BP-6ES
F6TC

NOTICE: Using an incorrect spark plug
may damage the engine.
4. When installing a new spark plug,
adjust the plug’s gap to the specification on the
Specifications chart. Do not pry against the
electrode, the spark plug can be damaged.

Operation

5. Install the new spark plug or
the cleaned spark plug into the engine.
• Gasket-style:
Finger-tighten until the gasket
contacts the cylinder head,
then tighten about 1/2-2/3 turn more.
• Non-gasket-style:
Finger-tighten until the plug
contacts the cylinder head,
then tighten about 1/16 turn more.
NOTICE: Tighten the spark plug properly.
If loose, the spark plug will cause the
engine to overheat.
If overtightened, the threads in the
engine block will be damaged.

Maintenance

6. Apply dielectric spark plug boot protector
(not included) to the end of the spark plug
and reattach the wire securely.

Page 14

For technical questions, please call 1-888-866-5797.

ITEM 61415

When the equipment is to remain idle for longer than
20 days, prepare the Engine for storage as follows:

c. Replace spark plug, but leave
spark plug cap disconnected.

1. CLEANING:
Wait for Engine to cool, then clean Engine with
dry cloth. NOTICE: Do not clean using water.
The water will gradually enter the Engine
and cause rust damage. Apply a thin coat
of rust preventive oil to all metal parts.

d. Pull Starter Handle to distribute oil in cylinder.
Stop after one or two revolutions when you
feel the piston start the compression stroke
(when you start to feel resistance).

To protect the fuel tank during storage, fill the
tank with gasoline that has been treated with
a fuel stabilizer additive. Follow fuel stabilizer
manufacturer’s recommendations for use. Refer
to Checking and Filling Fuel on page 9.
WARNING! TO PREVENT SERIOUS
INJURY FROM FIRE:
Fill tank in a well-ventilated area away from
ignition sources. If the engine is hot from
use, shut the engine off and wait for it to
cool before adding fuel. Do not smoke.
3. LUBRICATION:
a. Change engine oil.

NOTICE: During extended storage periods the
Engine must be started every 3 months and allowed
to run for 15 – 20 minutes or the Warranty is VOID.
5. AFTER STORAGE:
Before starting the Engine during or after
storage, keep in mind that untreated gasoline
will deteriorate quickly. Drain the fuel
tank and change to fresh fuel if untreated
gasoline has been sitting for a month, if
treated gasoline has been sitting beyond the
fuel stabilizer’s recommended time period,
or if the Engine does not start.

Setup

2. FUEL:

4. STORAGE AREA:
Cover and store in a dry, level, well-ventilated
area out of reach of children. Storage area should
also be away from ignition sources, such as
water heaters, clothes dryers, and furnaces.

Safety

Storage

Maintenance

Operation

b. Clean out area around spark plug.
Remove spark plug and pour one tablespoon of
engine oil into cylinder through spark plug hole.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 15

Troubleshooting
Problem

Possible Causes

Engine will not start FUEL RELATED:

Probable Solutions
FUEL RELATED:

Safety
Setup
Operation
Maintenance

1. No fuel in tank or fuel valve closed.

1. Fill fuel tank with fresh 87+ octane
stabilizer-treated unleaded gasoline and
open fuel valve.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

2. Choke not in START position, cold engine.

2. Move Choke to START position.

3. Gasoline with more than 10% ethanol used.
(E15, E20, E85, etc.)

3. Clean out ethanol rich gasoline from fuel
system. Replace components damaged by
ethanol. Use fresh 87+ octane stabilizertreated unleaded gasoline only.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

4. Low quality or deteriorated, old gasoline.

4. Use fresh 87+ octane stabilizer-treated
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

5. Carburetor not primed.

5. Pull on Starter Handle to prime.

6. Dirty fuel passageways.

6. Clean out passageways using
fuel additive. Heavy deposits
may require further cleaning.

7. Carburetor needle stuck.
Fuel can be smelled in the air.

7. Gently tap side of carburetor float
chamber with screwdriver handle.

8. Too much fuel in chamber. This can be
caused by the carburetor needle sticking.

8. Turn Choke to RUN position.
Remove spark plug and pull the
Start Handle several times to air out
the chamber. Reinstall spark plug
and set Choke to START position.

9. Clogged Fuel Filter.

9. Replace Fuel Filter.

IGNITION (SPARK) RELATED:

1. Spark plug cap not connected securely.

1. Connect spark plug cap properly.

2. Spark plug electrode wet or dirty.

2. Clean spark plug.

3. Incorrect spark plug gap.

3. Correct spark plug gap.

4. Spark plug cap broken.

4. Replace spark plug cap.

5. Incorrect spark timing or
faulty ignition system.

5. Have qualified technician diagnose/
repair ignition system.

COMPRESSION RELATED:

1. Cylinder not lubricated.
Problem after long storage periods.

1. Pour tablespoon of oil into
spark plug hole. Crank engine a
few times and try to start again.

2. Loose or broken spark plug.
(Hissing noise will occur
when trying to start.)

2. Tighten spark plug.
If that does not work, replace spark plug.
If problem persists, may have
head gasket problem, see #3.

3. Loose cylinder head or damaged
head gasket. (Hissing noise will
occur when trying to start.)

3. Tighten head.
If that does not remedy problem,
replace head gasket.

4. Engine valves or tappets
mis‑adjusted or stuck.

4. Have qualified technician adjust/
repair valves and tappets.

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

Page 16

For technical questions, please call 1-888-866-5797.

ITEM 61415

1. Spark plug cap loose.

1. Check wire connections.

2. Incorrect spark plug gap or
damaged spark plug.

2. Re-gap or replace spark plug.

3. Defective spark plug cap.

3. Replace spark plug cap.

4. Old or low quality gasoline.

4. Use only fresh 87+ octane stabilizer-treated
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

5. Incorrect compression.

5. Diagnose and repair compression.
(Use Engine will not start:
COMPRESSION RELATED section.)

1. Fuel tank empty or full of impure or low
quality gasoline.

1. Fill fuel tank with fresh 87+ octane
stabilizer-treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

2. Low oil shutdown.

2. Fill engine oil to proper level.
Check engine oil before EVERY use.

3. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.

3. Test/replace fuel tank cap.

4. Faulty magneto.

4. Have qualified technician service magneto.

5. Disconnected or improperly
connected spark plug cap.

5. Secure spark plug cap.

Engine stops when
under heavy load

1. Dirty air filter

1. Clean or replace element.

2. Engine running cold.

2. Allow engine to warm up prior
to operating equipment.

Engine knocks

1. Old or low quality gasoline.

1. Fill fuel tank with fresh 87+ octane
stabilizer-treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

2. Engine overloaded.

2. Do not exceed equipment’s load rating.

3. Incorrect spark timing, deposit buildup,
worn engine, or other mechanical problems.

3. Have qualified technician
diagnose and service engine.

1. Impure or low quality gasoline.

1. Fill fuel tank with fresh 87+ octane
stabilizer-treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

2. Engine too cold.

2. Use cold weather fuel and
oil additives to prevent backfiring.

3. Intake valve stuck or overheated engine.

3. Have qualified technician
diagnose and service engine.

4. Incorrect timing.

4. Check engine timing.

Engine stops
suddenly

Engine backfires

Safety

Probable Solutions

Setup

Engine misfires

Possible Causes

Operation

Problem

Maintenance

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 17

Warranties

Safety

Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.

Setup

To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid.
Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection verifies the defect, we will either repair or replace the product at our election or
we may elect to refund the purchase price if we cannot readily and quickly provide you with a replacement.
We will return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

Emissions Control System Warranty
Operation

United States Emissions Control
Defects Warranty Statement

Harbor Freight Tools Emissions Control
Defects Warranty Coverage

The United States Environmental Protection Agency (herein EPA)
and Harbor Freight Tools (herein HFT) are pleased to explain the
emissions control system warranty on your 2014-2015 Small OffRoad Engine (herein engine). Within the United States, new offroad, spark-ignition engines certified for model year 2014-2015,
must meet similar standards set forth by the EPA. HFT must
warrant the emissions control system on your engine for the
periods of time described below, provided there has been no
abuse, neglect or improper maintenance of your engine.

Engines are warranted for a period of two (2) years relative
to emissions control parts defects, subject to the provisions
set forth below. If any emissions related part on your engine
is defective, the part will be repaired or replaced by HFT.

Your emissions control system may include parts such as the
carburetor or fuel-injection system, and the ignition system.
Also included may be hoses, belts, connectors
and other emissions‑related assemblies.
Where a warrantable condition exists, HFT will repair your
engine at no cost to you including diagnosis, parts and labor.

Manufacturer’s Warranty Coverage

Maintenance

The 2014-2015 engines are warranted for two (2) years.
If any emissions-related part on your engine is defective,
the part will be repaired or replaced by HFT.

Owner’s Warranty Responsibilities
• As the engine owner, you are responsible for the performance
of the required maintenance listed in your Owner’s Manual.
HFT recommends that you retain all receipts covering
maintenance on your engine, but HFT cannot deny warranty
solely for the lack of receipts or for your failure to
ensure the performance of all scheduled maintenance.
• As the engine owner, you should, however, be aware
that HFT may deny you warranty coverage if your
engine or a part has failed due to abuse, neglect,
improper maintenance, or unapproved modifications.
• You are responsible for shipping your engine to a HFT
warranty station as soon as a problem exists. Contact the
HFT Customer Service department at the number below to
make shipping arrangements. The warranty repairs should be
completed in a reasonable amount of time, not to exceed 30 days.

If you have any questions regarding your warranty rights
and responsibilities, you should contact the Harbor Freight Tools
Customer Service Department at 1-888-866-5797.

Page 18

For technical questions, please call 1-888-866-5797.

ITEM 61415

HFT warrants to a first retail purchaser and each
subsequent purchaser that the engine is free from
defects in materials and workmanship that cause
the failure of warranted parts for a period of two (2) years
after the date of delivery to the first retail purchaser.

2. No Charge Repair or Replacement
Repair or replacement of any warranted part will be
performed at no charge to the owner if the work is
performed through a warranty station authorized by HFT.
For emissions warranty service, contact the HFT
Customer Service Department at 1-888-866-5797.

Component parts which are not scheduled for replacement
as required maintenance or are scheduled only for regular
inspection to the effect of “repair or replace as necessary”
are warranted for the warranty period. Any warranted part
which is scheduled for replacement as required maintenance
is warranted for the period of time up to the first scheduled
replacement point for that part. Any replacement part, provided
it is equivalent in durability and performance, may be used
in performance of maintenance or repairs. The owner is
responsible for commissioning a qualified technician/mechanic
to perform all required maintenance, as outlined in the
Inspection, Cleaning, and Maintenance section in this manual.

6. Warranted Parts
1)

3. Consequential Damages Coverage
Coverage under this warranty shall also extend to the failure
of any engine components caused by the failure of any
warranted part while it is still covered under this warranty.

4. Coverage Exclusions
3)

Operation

Warranty claims shall be filed in accordance with the provisions
of the HFT warranty policy explained in the box at the top of the
previous page. HFT shall not be liable for any loss of use of
the engine, for any alternative usage, for any damage to goods,
loss of time, or inconvenience. Warranty coverage shall also be
excluded for any part which fails, malfunctions, or is damaged
due to failure to follow the maintenance and operating instructions
set forth in the Owner’s Manual including, but not limited to:
a) Use of parts which are not authorized by HFT
b) Improper installation, adjustment or repair of
the engine or of any warranted part unless
performed by an authorized warranty center
c) Failure to follow recommendations on fuel use
contained in the Owner’s Manual
d) Improper or inadequate maintenance of any warranted parts
e) Repairs performed outside of
the authorized warranty service dealers
f) Alterations by changing, adding to or
removing parts from the engine.

Fuel Metering System
i) Carburetor and its internal parts.
ii) Fuel pump (if so equipped).
iii) Cold start enrichment system.
Air Induction System
i) Intake pipe/manifold.
ii) Air cleaner.
Ignition System
i) Spark plug.
ii) Magneto ignition system.
Catalyst System (if so equipped)
i) Exhaust pipe stud.
ii) Muffler.
iii) Catalytic converter (if so equipped).
Miscellaneous Items Used in Above Systems
i) Vacuum, temperature and time sensitive
valves and switches.
ii) Hoses, belts, connectors, and assemblies.

Safety

1. Length of Coverage

5. Service and Maintenance

Setup

Harbor Freight Tools Emissions Control
Defects Warranty Provisions

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LISTS AND ASSEMBLY
DIAGRAMS IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED
TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR
EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY
CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK
AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT
PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 19

Maintenance

PLEASE READ THE FOLLOWING CAREFULLY

Parts Lists and Diagrams

Parts List
Safety

Part

Setup
Operation
Maintenance

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53

Description

Head Subassembly, Cylinder
Plug, Spark
Bolt, Cylinder Head
Pin
Gasket, Cylinder Head
Cover Subassembly, Cylinder Head
Gasket, Cylinder Head Cover
Tube, Breather
Bolt Subassembly, Cylinder Head Cover
Washer Set
Stud
Stud
Crankcase Subassembly
Seal, Oil
Sensor, Engine Oil
Frame, Fuel Tank Installation
Plug, Rubber
Protector, Oil
Bolt
Washer
Bolt, Drain Plug
Clip
Arm, Governor
Ring, Seal
Pin
Bolt
Bolt
Cover , Crankcase
Gasket, Crankcase
Plug Subassembly, Engine Oil
Dipstick Subassembly, Oil
Pin
Bolt
Bearing
Gear Asm, Governor
Seal, Oil
Crankshaft Asm.
Piston
Pin, Piston
Clip, Piston Pin
Rod, Connecting
Ring, Primary
Ring, Secondary
Ring Set, Oil
Camshaft Asm.
Valve, Intake
Valve, Exhaust
Spring, Valve
Retainer, Valve Spring
Valve Retainer
Guide, Seal
Retainer, Valve Spring
Lifter, Valve

Page 20

Qty
1
1
4
2
1
1
1
1
1
1
2
2
1
1
1
2
2
1
1
2
2
1
1
1
1
4
2
1
1
1
1
2
7
1
1
1
1
2
1
1
1
1
1
1
1
1
1
2
1
2
1
2
2

Part
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105

Description

Tappet, Valve
Plate Subassembly, Lifter Stopper
Bolt, Valve Adjusting
Rocker, Valve
Nut, Valve Adjusting
Nut, Valve Lock
Starter Asm, Recoil
Bolt
Shroud
Shroud, Cylinder Boy
Bolt
Switch Subassembly, Stop Engine
Bolt
Terminal
Carburetor Asm.
Gasket, Air Cleaner
Gasket, Carburetor
Plate, Carburetor Insulator
Gasket, Carburetor Insulator
Nut
Cleaner, Air
Block, Muffler Seat Reinforcing
Pipe, Exhaust
Gasket, Exhaust Outlet
Nut
Muffler Asm.
Tank, Fuel
Strainer, Fuel
Cover, Fuel Tank
Outlet Subassembly, Fuel Tank Oil
Hose Clamp
Tube, Fuel
Hose Clip
Nut
Canister
Hose Clamp
Hose
Hose
Nut, Flywheel
Pulley,Starter
Impeller
Flywheel Subassembly
Bolt
Coil, Ignition
Control Subassembly, Throttle
Spring, Throttle Valve Returning
Rod, Governor
Spring, Governor
Support Subassembly, Governor
Bolt
Nut
Bolt, Governor Support

For technical questions, please call 1-888-866-5797.

Qty
2
1
2
2
2
2
1
4
1
1
1
1
5
1
1
1
1
1
1
2
1
1
1
1
5
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1

ITEM 61415

Safety
79

33
33

48
56

42 43 44

3
3

Setup

87
87

84
91

84
85

21
20

25
24
23

103

96
96

101
104

105 100
102

Note: Some parts are listed and shown for illustration purposes only,
and are not available individually as replacement parts.

Operation

78 78

6
52
58

Maintenance

75
76

Assembly Diagram

78
78

8
59

71
70

Record Product’s Serial Number Here:
Note: If product has no serial number,
record month and year of purchase instead.

Page 21

For technical questions, please call 1-888-866-5797.

ITEM 61415

0.4" / 12mm

Setup

7.6" / 195.5mm

6.1" / 155.5mm

Operation

Maintenance

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 22

Mounting Hole Diagram

Safety

0.5" / 13mm

Note: Not to scale.

3.7" / 95.5mm

Safety
Maintenance

Operation

Setup

Power Take-Off Diagram

Note: Not to scale.

ITEM 61415

For technical questions, please call 1-888-866-5797.

Page 23

3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • 1-888-866-5797

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Harbor Freight 8 Hp 301Cc Ohv Horizontal Shaft Gas Engine Epa Product Manual

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