Harbor Freight Tools (173cc) Product manual

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
173cc
Vertical Engine
Using an engine indoors
CAN KILL YOU IN MINUTES.
Engine exhaust contains carbon monoxide.
This is a poison you cannot see or smell.
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 69731
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© 2012 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
Maintenance............................................... 12
Safety.......................................................... 3
Warranties.................................................. 17
Set Up......................................................... 7
Parts Lists and Diagrams........................... 18
Operation..................................................... 9
Specifications
Engine Type
Cooling System
Type
Fuel
Capacity
Type SAE
Engine Oil
Capacity
Run Time @ 50% Load
with full tank
Sound Level
Bore x Stroke
Displacement
Compression Ratio
Rotation viewed from PTO
(power takeoff - the output shaft)
Mounting Base Pattern
Shaft dia.
Keyway
Shaft
End Tapped
Type
Spark Plug
Valve Clearance
Speed
Page 2
Gap
Intake
Exhaust
Idle
Vertical Single Cylinder 4 stroke OHV
EPA phase III and CARB compliant
Forced air cooled
87+ octane stabilizer treated
unleaded gasoline
0.3 gallon (1.1 liter)
10W-30 above 32° F
5W30 at 32° F or below
0.6 Quart
40 minutes
104 dB
70 mm x 45 mm
173cc
8.5:1
Counterclockwise
8" (203mm); 3/8"-24 UNF tapped hole;
2 x 8.7mm through-hole
7/8″ x 3.16″
3/16″ (4.76 mm)
3/8″ - 24
NGK® BP-6ES/BPR6ES
DENSO®: W16EPR-U/W16EP-U
CHAMPION®: RN9YC4
NHSP®: F7TC/F7RTC
TORCH®: F7TC/F7RTC
0.7 - 0.8 mm
0.10 - 0.15 mm
0.15 - 0.20 mm
1,800 ± 50 RPM
For technical questions, please call 1-888-866-5797.
Item 69731
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.
Symbol Definitions
Symbol
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.
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.
Operation
Setup
Safety Warnings
Set up Precautions
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.
Item 69731
5. Wear ANSI-approved safety goggles, heavy-duty
work gloves, and dust mask/respirator during set up.
For technical questions, please call 1-888-866-5797.
Page 3
Maintenance
SAVE THESE INSTRUCTIONS
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.
1.
Safety
NEVER use inside a home or garage, EVEN IF
doors and windows are open.
12. Wear ANSI-approved safety glasses, hearing
protection, and NIOSH-approved dust mask/
respirator under a full face shield along
with steel-toed work boots during use.
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.
Setup
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.
Only use OUTSIDE and far away from windows,
doors, and vents.
2. Keep children away from the equipment,
especially while it is operating.
16. Stay alert, watch what you are doing and
use common sense when operating this
piece of equipment. Do not use this piece
of equipment while tired or under the
influence of drugs, alcohol or medication.
Operation
3. Keep all spectators at least six feet
from the Engine during operation.
17. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the equipment in unexpected situations.
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.
18. Use this equipment with both hands
only. Using equipment with only one hand
can easily result in loss of control.
5. Do not touch engine during use.
Let engine cool down after use.
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.
19. 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.
20. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
21. Do not cover the engine or
equipment during operation.
Maintenance
8. Secure the Engine on transport vehicles to
prevent the tool from rolling, slipping, and tilting.
22. Keep the equipment, engine, and
surrounding area clean at all times.
9. Industrial applications must follow
OSHA requirements.
23. 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.
10. Do not leave the equipment unattended when it is
running. Turn off the equipment (and remove safety
keys, if available) before leaving the work area.
11. Engine can produce high noise levels.
Prolonged exposure to noise levels above 85
dBA is hazardous to hearing. Always wear
ear protection when operating or working
around the gas engine while it is operating.
Page 4
24. Do not operate the equipment with known
leaks in the engine’s fuel system.
For technical questions, please call 1-888-866-5797.
Item 69731
26. 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.
27. Keep hands and feet away from moving
parts. Do not reach over or across
equipment while operating.
28. 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.
29. 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.
30. Follow equipment manufacturer’s
operation precautions.
Safety
25. 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.)
a. Release the brake handle,
stopping the engine.
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.
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.
THE ENGINE BRAKE IS FOR EMERGENCY
SHUTOFF; DO NOT REPLACE THE BRAKE
SPRING WITH A WEAKER SPRING.
7. Store equipment out of the reach of children.
8. Follow scheduled engine and
equipment maintenance.
Refueling:
1. Do not smoke, or allow sparks, flames,
or other sources of ignition around the
equipment, especially when refuelling.
Operation
1. Before service, maintenance, or cleaning:
Setup
Service Precautions
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.
4. Refuel in a well-ventilated area only.
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.
Maintenance
SAVE THESE INSTRUCTIONS.
Item 69731
For technical questions, please call 1-888-866-5797.
Page 5
Engine Components
Fuel Cap
Safety
Priming
Bulb
Setup
Starter
Handle
Dipstick
Muffler
Operation
Air
Filter
Brake
Arm
Throttle
Maintenance
XXXXXXXXXX
Serial
Number
Location
(Write on front
cover of manual.)
Page 6
For technical questions, please call 1-888-866-5797.
Item 69731
Set Up
Safety
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.
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.
The emission control system for this Generator’s Engine is warranted for standards set
by the U.S. Environmental Protection Agency and by the California Air Resources Board
(also known as CARB). For warranty information, refer to the last pages of this manual.
WARNING! DO NOT INSTALL THIS ENGINE ON A VEHICLE.
NOT FOR HIGHWAY USE. FOLLOW ALL APPLICABLE LAWS FOR INSTALLATION AND USE.
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.
Setup
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.
Carburetor
Assembly
Operation
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.
Fuel Cup Seal
Mixing Tube
(might remain
inside carburetor)
1. Turn off the engine.
Main Jet
2. Close the fuel valve.
3. Place a bowl under the fuel cup
to catch any spilled fuel.
Fuel Cup
CAUTION! Carburetor bowl may have gas in
it which will leak upon removing the bolt.
Maintenance
Bolt Seal
4. Unthread the bolt holding the fuel cup.
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.
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).
Item 69731
Bolt
High Altitude Kit Parts List - A
Part
1a
2a
3a
4a
Description
Main Jet 3000-6000 ft.
Main Jet 6000-8000 ft.
Bolt Seal
Fuel Cup Seal
For technical questions, please call 1-888-866-5797.
Qty
1
1
1
2
Page 7
Installation
1. IMPORTANT: If you have any doubts about your
ability to perform the following procedures, have a
qualified service technician perform the installation.
Safety
2. Install this engine on a lawn mower only.
Do not use to power a vehicle.
3. Mounting hole locations:
a
6. Insert the mower’s brake cable sheath through the
hole in the Brake bracket. Secure the mower brake
cable to the brake arm. Adjust the brake cable
sheath to remove all slack and secure it in place
using the adjusting nuts on the cable sheath, as
shown in the illustration below.
THE ENGINE BRAKE IS FOR EMERGENCY
SHUTOFF; DO NOT REPLACE THE BRAKE
SPRING WITH A WEAKER SPRING.
If operating the engine brake is too
difficult, a qualified technician must install
a different brake handle on the mower.
Note: The brake cable on some mowers may
need to be adjusted in a different manner. Install
according to mower manufacturer’s instructions.
Brake
Arm
b
Setup
Brake
Cable
b
a. one 3/8 in. x 24 threaded; 1 in. deep
b. two Ø0.34 in. / 8.7mm unthreaded
(use 5/16 in. / 8mm diameter hardware)
Throttle
Control
Operation
4. Set the Engine upright on the mower,
and align at least three engine mounting
holes with mower mounting holes.
Throttle
Cable
NOTE: Depending on the mower, it may be necessary
to drill mounting holes or make a mounting plate
to align with the engine mounting holes. Only a
qualified technician should attempt these solutions.
Bracket
and
Bolt
5. Use hardened, stainless steel Bolts, Lock Washers,
and Washers (not included) of appropriate length
and diameter to secure the Engine to the mower.
Make sure the hardware will not contact
moving parts during operation.
Brake
Cable
Bracket
7. Attach the end of the mower’s Throttle Cable to
the Throttle Control. Use the Bracket and Bolt
to secure its sheath in place as shown above.
8. Refer to the mower’s service manual for instructions
on how to properly attach a belt drive pulley, chain
drive gear, etc. onto the output shaft of the Engine.
Maintenance
Page 8
For technical questions, please call 1-888-866-5797.
Item 69731
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
Checking and Filling Fuel
CAUTION! 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.
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.
2. 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.
1. Clean the Fuel Cap and the area around it.
2. Unscrew and remove the Fuel Cap.
Setup
1. Make sure the engine is stopped and is level.
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, effecting
engine performance and/or causing damage.
4. Then replace the Fuel Cap.
3. 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, the top of the
crosshatched area on the dipstick as shown above.
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.
Operation
Full level
4. If the oil level is below the full level add the
appropriate type of oil until the oil level is at the
correct level. SAE 10W‑30 oil is recommended for
general use. (The SAE Viscosity Grade chart on
page 13 in the Maintenance section shows other
viscosities to use in different average temperatures.)
5. Thread the Dipstick back in clockwise.
Item 69731
For technical questions, please call 1-888-866-5797.
Maintenance
CAUTION! Do not run the engine with too little oil.
The engine will be permanently damaged.
Page 9
Starting the Engine
Before Starting the Engine:
Safety
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 fuel and oil.
d. Read the Equipment Operation section
in the equipment manual.
e. Move the mower to a location that is flat, level, and
free from loose objects (such as rocks or sticks).
The mower may be difficult to start on grass.
Setup
1. Press the Priming Bulb 2-3 times to prime the engine.
Operation
2. Adjust the Mower’s Throttle control to full throttle.
1
2
Note: Location, operation, and design of the Throttle
control will vary from manufacturer to manufacturer.
3
Maintenance
3. Hold the mower’s brake handle closed.
Page 10
For technical questions, please call 1-888-866-5797.
Item 69731
Note: Do not let the Starter Handle snap back against the
engine. Hold it as it recoils so it doesn't hit the engine.
5. Allow the Engine to run for several seconds.
Then, the Mower’s Throttle control can be
adjusted as desired for operation.
Safety
4. Grip the Starter Handle of the Engine loosely and pull it
gently until resistance is felt. Allow Cable to retract fully
and then pull it quickly. Repeat until the engine starts.
4
5
Setup
IMPORTANT: Allow the engine to run at
no load for a minute or two after each start‑up
so that the engine can stabilize.
6. Break-in Period:
a. Breaking-in the engine will help to ensure proper equipment and engine operation.
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.
c. The maintenance break-in period will last about 20 hours of use. After this period:
Operation
• Change the engine oil.
Under normal operating conditions subsequent maintenance follows the
schedule explained in the MAINTENANCE AND SERVICING section.
Stopping the Engine
Maintenance
To stop the engine, release the brake handle.
Item 69731
For technical questions, please call 1-888-866-5797.
Page 11
Maintenance
WARNING
Safety
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING:
Release the brake handle, 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 cleaner
Check deposit cup
Change engine oil
Operation
*
Clean/replace air cleaner
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 69731
Checking and Filling Fuel
Safety
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.
1. Clean the Fuel Cap and the area around it.
Full level
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, effecting
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.
Engine Oil Change
CAUTION! Oil is very hot during operation and can
cause burns. Wait for engine to cool before changing oil.
1. Make sure the engine is stopped.
2. Clean the top of the Dipstick and the
area around it. Remove the Dipstick
by threading it counterclockwise.
6. 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, the top of the
crosshatched area on the dipstick as shown above.
7. Thread the dipstick back in clockwise.
CAUTION! Do not run the engine with too little oil.
The engine will be permanently damaged.
Air Filter Element Maintenance
1. Remove the air filter cover and the air filter elements
and check for dirt. Clean as described below.
2. Cleaning:
• 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.
3. Tilt the engine over a suitable oil
container far enough to allow all the oil
to drain out. Recycle used oil.
4. Wipe off the dipstick with a clean lint free rag.
5. 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.
Setup
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.
3. Install the cleaned filter. Secure the
Air Cleaner Cover before use.
Operation
2. Unscrew and remove the Fuel Cap.
Spark Plug Maintenance
SAE Viscosity Grade
30
Maintenance
Spark
Plug
Cap
10W-30
1. Disconnect spark plug cap from end of plug.
Clean out debris from around spark plug.
5W-30
-20
0
20
40
60
80
Average outdoor temperature
Item 69731
100°F
2. Using a spark plug wrench, remove the spark plug.
For technical questions, please call 1-888-866-5797.
Page 13
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.
Safety
Recommended Spark Plugs
Brand
NGK®
NHSP® / TORCH®
DENSO®
CHAMPION®
Plug
BP-6ES/BPR6ES
F7TC/F7RTC
W16EPR-U/W16EP-U
RN9YC4
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.
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 about 1/2-2/3 turn
more.
Non-gasket-style: Finger-tighten until the plug
contacts the head, then 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.
6. Apply dielectric spark plug boot protector
(not included) to the end of the spark
plug and reattach the wire securely.
Storage
Setup
When the equipment is to remain idle for longer than 20
days, prepare the Engine for storage as follows:
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.
2. FUEL:
Operation
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
Checking and Filling Fuel chart 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.
a. Place a funnel leading to a proper gasoline
container below the carburetor.
c. After all fuel has drained, reinstall the
drain bolt. Tighten securely.
3. LUBRICATION:
a. Change engine oil.
b. Clean out area around spark plug.
Remove spark plug and pour one tablespoon of
engine oil into cylinder through spark plug hole.
c. Replace spark plug, but leave
spark plug cap disconnected.
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).
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.
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.
Maintenance
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.
Drain Plug
b. Remove the drain bolt from the bottom of the
carburetor bowl and allow the fuel to drain.
Page 14
For technical questions, please call 1-888-866-5797.
Item 69731
Troubleshooting
Engine misfires
MOWER ENGINE SPECIFIC:
1. Brake Handle not held or brake cable
not connected properly.
1. Make sure brake handle is held down
and brake cable is properly adjusted.
2. Mower on top of grass.
2. Start mower atop clear area free
of loose objects and grass.
FUEL RELATED:
FUEL RELATED:
1. No fuel in tank.
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. Low quality or deteriorated, old gasoline.
2. Use fresh 87+ octane stabilizer-treated
unleaded gasoline..
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
3. Carburetor not primed.
3. Press priming bulb before starting cold engine.
4. Dirty fuel passageways.
4. Clean out passageways using fuel additive.
Heavy deposits may require further cleaning.
5. Carburetor needle stuck.
Fuel can be smelled in the air.
5. Gently tap side of carburetor float
chamber with screwdriver handle.
6. Too much fuel in chamber.
This can be caused by
the carburetor needle sticking.
6. Turn Throttle to full position. Remove spark plug
and pull the start handle several times
to air out the chamber. Reinstall
spark plug and attempt to restart.
IGNITION (SPARK) RELATED:
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:
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 diagnose/
repair ignition system.
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.)
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
Item 69731
For technical questions, please call 1-888-866-5797.
Page 15
Setup
MOWER ENGINE SPECIFIC:
Safety
Probable Solutions
Operation
Engine will not start
Possible Causes
Maintenance
Problem
Problem
Engine stops
suddenly
Possible Causes
Probable Solutions
1. Fill engine oil to proper level.
Check engine oil before EVERY use.
2. Fuel tank empty or full of impure or low
quality gasoline.
2. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
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 stabilizertreated 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 stabilizertreated 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.
Safety
1. Low oil shutdown.
Setup
Engine backfires
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
Operation
Warranties
Limited 90 Day Warranty
Maintenance
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.
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.
Page 16
For technical questions, please call 1-888-866-5797.
Item 69731
Emission Control System Warranty
Where a warrantable condition exists, HFT will repair your
engine at no cost to you including diagnosis, parts and labor.
Manufacturer’s Warranty Coverage
The 2014-2015 engines are warranted for two (2) years.
If any emission-related part on your engine is defective,
the part will be repaired or replaced by HFT.
Harbor Freight Tools Emission Control
Defects Warranty Coverage
Engines are warranted for a period of two (2) years relative
to emission control parts defects, subject to the provisions
set forth below. If any emission 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.
Harbor Freight Tools Emission Control
Defects Warranty Provisions
1. Length of Coverage
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.
Item 69731
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.
5. Service and Maintenance
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)
Fuel Metering System
i) Carburetor and its internal parts.
ii) Air/fuel ratio feedback and control system.
iii) Cold start enrichment system.
iv) Fuel Tank.
2) Air Induction System
i) Controlled hot air intake system.
ii) Intake manifold.
iii) Air filter.
3) Ignition System
i) Spark Plugs.
ii) Magneto or electronic ignition system.
iii) Spark advance/retard system.
4) Exhaust Gas Recirculation (EGR) System (if so equipped)
i) EGR valve body, and carburetor spacer.
ii) EGR rate feedback and control system.
5) Air Injection System
i) Air pump or pulse valve.
ii) Valves affecting distribution of flow.
iii) Distribution manifold.
6) Catalyst or Thermal Reactor System (if so equipped)
i) Catalytic converter.
ii) Thermal reactor.
iii) Exhaust manifold.
7)Particulate Controls
Traps, filters, precipitators, and any other device
used to capture particulate emissions.
For technical questions, please call 1-888-866-5797.
Page 17
Safety
4. Coverage Exclusions
Setup
Your emission 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 emission-related assemblies.
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.
Operation
The California Air Resources Board (herein CARB), the
United States Environmental Protection Agency (herein EPA),
and Harbor Freight Tools (herein HFT) are pleased to explain the
emission control system warranty on your 2014-2015 Small OffRoad Engine (herein engine). In California, the engine must be
designed, built and equipped to meet the State’s stringent antismog standards. Elsewhere 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 emission 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.
3. Consequential Damages Coverage
Maintenance
California and United States Emission
Control Defects Warranty Statement
Parts Lists and Diagrams
PLEASE READ THE FOLLOWING CAREFULLY
Safety
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
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.
Parts List
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
Description
Cover, Cylinder Head
Gasket, Cylinder Head
Head Sub., Cylinder
Gasket, Cylinder Head
Bolt
Plug, Spark
Bolt, Cylinder Head
Bracket, Muffler Shield
Bolt
Stud
Pin
Crankcase Sub.
Shield, Crankcase Side
Dipstick Sub., Oil
Bolt
Bolt
Bracket, Fuel Tank Right
Seal, Oil
Bolt
Bolt
Plate, Breather Cover
Gasket, Breather
Breather
Screen, Breather
Shield, Crankcase Rear
Bearing
Bracket, Fuel Tank Left
Bolt
Arm, Governor
Washer
Seal, Oil
Pin
Gasket, Crankcase
Pin
Washer
Block, Returning Oil
Qty
1
1
1
1
4
1
4
1
1
2
2
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
Part
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
Description
Bolt
Plate, Governor Spindle
Seal, Oil
Bolt
Gear Asm, Governor
Cover, Crankcase
Ring, Primary
Ring, Secondary
Ring Set, Oil
Piston
Clip, Piston Pin
Pin, Piston
Rod, Connecting
Crankshaft Asm.
Nut, Valve Lock
Nut, Valve Adjusting
Seat, Valve Spring
Rocker, Valve
Spring, Valve
Guide, Seal
Bolt, Valve Adjusting
Valve, Intake
Plate Sub., Lifter Stopper
Lifter, Valve
Tappet, Valve
Camshaft Asm.
Valve, Exhaust
Starter Asm, Recoil
Housing, Engine
Shroud
Nut
Stud
Stud
Gasket, Insulator Plate
Plate, Carb. Insulator
Gasket, Carburetor
Qty
1
1
1
6
1
1
1
1
1
1
2
1
1
1
2
2
2
2
2
1
2
1
1
2
2
1
1
1
1
1
3
2
1
1
1
2
Part
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
106
107
108
Description
Gasket, Carb. Insulator
Carburetor Asm.
Gasket, Air Cleaner
Valve, Enrichment
Gasket, Air Cleaner
Tube, Breather
Nut
Case, Air Cleaner
Element, Air Cleaner
Cover, Air Cleaner Case
Cover, Muffler Outer
Muffler Asm.
Gasket, Exhaust Outlet
Nut
Strainer, Fuel
Clamp
Tube, Fuel
Clamp
Bolt
Tank Asm, Fuel
Nut, Flywheel
Flywheel Subassembly
Bolt
Coil, Ignition
Brake Asm.
Bolt
Bolt
Rod, Governor
Spring, Throttle Returning
Control Asm, Throttle
Bolt
Support Sub., Governor
Bolt, Governor Support
Nut
Spring, Governor
Clip
Qty
1
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only,
and are not available individually as replacement parts.
Page 18
For technical questions, please call 1-888-866-5797.
Item 69731
Assembly Diagram
67
67
Safety
67
65
66
68
68
93
99
69
64
94
98
97
20
20
21
19
15
16
15
13
92
22
23
24
25
17
91
18
45
28
29 30 32
31
12
44
43
47
53
10
6
1
7
5
7
53
10
3
2
52
54
70 71
51
72
55
52
61
63
60
61
41
60
33
34
54
76
35
37
38
34
78
80
36
81
82
77
42
75
39
40
40
Item 69731
107
103
57
73 74
72
106
102
56
57 59
51
7
55
105
108
49
46
58
9
11
50
62
Operation
48
11
4
40
40
For technical questions, please call 1-888-866-5797.
Maintenance
85
8
5
104
101
7
5
100
26
47
84
5
90
27
14
83
87
88 89
86
86
91
Setup
95
96
79 79
40
40
Page 19
Mounting Hole Diagram
Note: Not to scale.
A
Ø8 in. / 203mm
6*Ø0.35 in. / 9mm
Ø0.24 in. / 6mm
3.27 in. / 83mm
A
Ø0.34 in. / 8.7mm
A-A
2:1
Ø1 in. / 25.4mm
Ø0.24 in.
/ 6mm
0.98 in. / 25mm
Ø0.34 in.
/ 8.7mm
3.94 in. / 100mm
3.85 in. / 97.7mm
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • 1-888-866-5797
www.harborfreight.com
3/8 in. x 24
1.1 in. / 28mm