Harbor Freight Tools Predicator 212cc User manual

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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. 21j
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©2021 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 ma y n o t b e i n c l u d e d .
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Page 2 O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1 ITEM 57531
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Specifications ...............................................................2
Safety ...........................................................................3
Setup ............................................................................6
Installation ....................................................................8
Maintenance................................................................ 11
Troubleshooting........................................................... 14
Parts List and Diagrams .............................................. 16
Limited 90 Day Warranty .............................................20
J/*4"2"4,$"&8#
Displacement 212 cc
Engine Type Horizontal Single Cylinder
4-stroke
Cooling System Forced air cooled
Fuel Type 91+ octane stabilizer-treated
unleaded gasoline
Engine Oil Type SAE 10W-30 High quality synthetic oil
Capacity 0.63 Quart
Bore x Stroke 70 mm x 55 mm
Compression Ratio 8.5:1
Torque Specification for
Cylinder Head Bolts 26 – 30 Nm (19 – 22 ft-lb)
Rotation viewed from PTO
(power takeoff - the output shaft) Counterclockwise
Spark Plug Type Torch ®F7TC
Gap 0.023" – 0.031"
Valve Clearance Intake 0.003" – 0.005"
Exhaust 0.005" – 0.007"
Speed Idle 1600 RPM
Maximum 6000 RPM
Shaft
Shaft Ø0.75" x 2.43"
Keyway 1.79" for 0.188" Key
End Tapped 5/16" – 24 UNF
THIS ENGINE IS FOR COMPETITION USE ONLY. INSTALLING THIS ENGINE IN ANY DIFFERENT
APPLICATION MAY BE A VIOLATION OF FEDERAL LAW SUBJECT TO CIVIL PENALTY.
This Engine is for competition only and is exempt from emission standards and related requirements.

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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.
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.
JL5+&7%P*2"8"$"&8#
JL5+&7 W(&/*($L%&(%J$,$*5*8$
MWH Revolutions Per Minute
[W 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.
JL5+&7 W(&/*($L%&(%J$,$*5*8$
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.
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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.
2. Have multiple ABC class fire extinguishers nearby.
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.
4. Set up and use only on a flat, level,
well-ventilated surface.
5. Wear ANSI-approved safety goggles, heavy-duty
work gloves, and dust mask/respirator during set up.
6. Use only lubricants and fuel recommended
in the Specifications chart of this manual.

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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.
2. Keep children away from the equipment,
especially while it is operating.
3. Keep all spectators at least six feet
from the Engine during operation.
4. Fire Hazard! Do not fill fuel 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.
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.
8. Secure the engine on transport vehicles to
prevent it from rolling, slipping, and tilting.
9. Industrial applications must follow
OSHA requirements.
10. 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 or
when working nearby while it is operating.
11. Wear ANSI-approved safety glasses
and hearing protection during use.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
18. Do not cover the engine during operation.
19. Keep the engine and surrounding
area clean at all times.
20. Do not smoke, or allow sparks, flames,
or other sources of ignition around the
equipment, especially when refuelling.
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. 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.
24. Keep hands and feet away from moving parts.
Do not reach over or across
equipment while operating.
25. Before use, check for misalignment or binding of
moving parts, breakage of parts, and any other
condition that may affect the equipment’s operation.
D2%9,5,3*9N%.,Q*%$.*%*R'"/5*8$%#*(Q"4*9%
+*2&(*%'#"831 Many accidents are caused
by poorly maintained equipment.
26. 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.

Page 5O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1ITEM 57531
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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. Wear ANSI-approved safety goggles,
heavy-duty work gloves, and
dust mask/respirator during service.
4. Maintain labels and nameplates on the equipment.
These carry important information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
5. 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.
6. Store equipment out of the reach of children.
7. Follow scheduled engine and
equipment maintenance.
M*2'*7"83-
1. Do not refill the fuel tank while the
engine is running or hot.
2. Do not smoke, or allow sparks, flames,
or other sources of ignition around the
equipment, especially when refuelling.
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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.
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The preparation of this Engine for competitive events and sanctioned racing requires specific,
specialized skill and knowledge. This preparation must be completed before starting or
operating the engine. If you are uncertain about your ability to perform any procedures in
this manual safely or correctly have the work performed by a qualified mechanic.
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.
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Inspect Engine and components (components not included) which will be installed on
Engine looking for damaged, loose, and missing parts before installation, set up and
starting. If any problems are found, do not use equipment until fixed properly.
B&$*- For additional information regarding the parts listed in the following pages,
refer to Parts List and Diagrams on page 16.
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1. Using a motor mount plate specifically designed
for the go-kart frame to be used (both not
included), install the motor mount onto the
frame. Secure in place using hardware supplied
with the motor mount (not included).
2. Align the mounting holes on the Engine
Installation Plate with the four mounting
bolts on the motor mount plate.
3. Lower Engine onto motor mount and secure
in place with hardware supplied with the motor
mount (not included). Refer to motor mount
installation instructions for torque specifications.
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1. Install the Exhaust Port Gasket
onto the exhaust port studs.
2. Attach the exhaust pipe/muffler (not
included) to the studs using two spring
washers and two M8 nuts.
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1. Mount the fuel pump (not included) onto the Fuel
Pump Installation Plate located on top of the Engine.
Secure pump in place using two M6 x16 bolts.
2. There are three tubes (not included)
that attach to the fuel pump:
a. Inlet fuel line from fuel tank (tank not included).
b. Outlet fuel line to Carburetor.
c. Low pressure pulse tube that is attached
to the Pulse Connector (not included).
When installing ensure that these tubes are
routed to avoid heat and sharp edges.
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1. Locate the fuel line connector on the Carburetor.
2. Attach the outlet fuel line from the fuel pump
(not included, see 2.b. under Install Fuel Pump)
to the connector on the Carburetor. Route
Carburetor drain hose to safe drain area.
B&$*- Ensure that the drain hose is
routed to avoid heat and abrasion.
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1. Install an air filter using a filter clamp (both
not included) to the Carburetor inlet.
2. Connect one end of a throttle cable (not included)
to the Carburetor slide. Connect the other
end to the throttle on the go-kart frame.
B&$*- This engine is not equipped with a governor.
Install a throttle return spring before use.
3. Insert one end of an oil breather tube (not
included) into the hole on the Valve Cover.
Route the other end of the tube to an overflow
can (not included). If necessary, attach an
extension tube (not included) to the end of the
oil breather tube to reach the overflow can.
B&$*- Ensure that oil breather flow is
not restricted by tubing or overflow can,
which must be vented to atmosphere.
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B&$*- This maintenance schedule is intended solely as a general guide. If performance decreases or if
equipment operates unusually, check systems immediately. The maintenance needs of each piece of equipment
will differ depending on factors such as duty cycle, temperature, air quality, fuel quality, and other factors.
B&$*- The following procedures are in addition to the regular checks and maintenance
explained as part of the regular operation of the Engine and equipment.
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a. Breaking-in the engine will help to ensure proper equipment and engine operation.
b. The operational break-in period will last about 10 hours of use.
Do not operate the engine at its maximum speed during this period.
c. Change the engine oil after the initial break-in period.
d. Check/adjust valve clearance after the initial break-in period.
Under normal operating conditions subsequent maintenance follows the schedule explained below.
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Brush off outside of engine
Check engine oil level
Check air cleaner
Check sediment cup
Change engine oil
Clean 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.

Page 12 O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1 ITEM 57531
JAO6IF J6I?W DBJIAEEAIDGB HADBI6BAB@6
@.*4a"83%,89%O"77"83%O'*7
XAMBDBYf IG%WM6!6BI%J6MDG?J%
DBb?MF%OMGH%ODM6-
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.
2. Unscrew and remove the Fuel Cap.
3. Remove the Strainer and remove any dirt
and debris. Then replace the Strainer.
B&$*-%%P&%8&$%'#*%3,#&7"8*%4&8$,"8"83%5&(*%$.,8%
>ij%*$.,8&7%c6>id1%%P&%8&$%'#*%6T;%*$.,8&71%%A99%2'*7%
#$,+"7"k*(%$&%$.*%3,#&7"8*%&(%$.*%X,((,8$L%"#%!GDP1
B&$*-%%P&%8&$%'#*%3,#&7"8*%$.,$%.,#%+**8%#$&(*9%"8%,%
5*$,7%2'*7%4&8$,"8*(%&(%,%9"($L%2'*7%4&8$,"8*(1%%D$%4,8%
4,'#*%/,($"47*#%$&%*8$*(%$.*%4,(+'(*$&(N%,22*4$"83%
*83"8*%/*(2&(5,84*%,890&(%4,'#"83%9,5,3*1
4. If needed, fill the Fuel Tank to about 1 inch under
the fill neck of the Fuel Tank with 91 octane or
higher unleaded gasoline that has been treated
with a fuel stabilizer additive. Follow fuel stabilizer
manufacturer’s recommendations for use.
5. Then replace the Fuel Cap.
6. 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.
A"(%O"7$*(%H,"8$*8,84*
1. Remove the Air Cleaner Cover and the air filter(s)
and check for dirt. Clean as described below.
2. @7*,8"83-
• For paper filters:
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 filter.
• For foam filters:
Wash the filter 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. Install the cleaned filter(s). Secure the
Air Cleaner Cover before use.
683"8*%G"7%@.,83*
@A?IDGBf 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 and is level.
2. Close the Fuel Valve.
3. Place a drain pan (not included) underneath
the crankcase’s drain plug.
4. Remove the drain plug and, if possible,
tilt the crankcase slightly to help drain
the oil out. Recycle used oil.
5. Replace the drain plug and tighten it.
6. Clean the top of the Dipstick and the area around it.
Remove the Dipstick by turning it counterclockwise,
and wipe it off with a clean, lint free rag.
7.
Full level
Full level
Add the appropriate type of oil until the
oil level is at the full level. SAE 10W-30
synthetic oil is recommended.
The SAE Viscosity Grade chart shows other
viscosities to use in different average temperatures.
>iXS=i
;XS=i
-20 0 20 40 60 80 100°F
JA6%!"#4&#"$L%Y(,9*#
AQ*(,3*%&'$9&&(%$*5/*(,$'(*
8. Thread the dipstick back in clockwise.
BGID@6-%%P&%8&$%('8%$.*%683"8*%)"$.%$&&%7"$$7*%&"71%%
I.*%683"8*%)"77%+*%/*(5,8*8$7L%9,5,3*91

Page 13O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1ITEM 57531
JAO6IFJ6I?WDBJIAEEAIDGBHADBI6BAB@6
J/,(a%/7'3%H,"8$*8,84*
1.
J/,(a%
W7'3%
@,/
Disconnect spark plug cap from end of plug.
Clean out debris from around spark plug.
2. Using a spark plug wrench, remove the spark plug.
3. Inspect the spark plug:
If the electrode is oily, clean it using a clean, dry rag.
If the electrode has deposits on it, polish it using
emery paper. If the white insulator is cracked or
chipped, the spark plug needs to be replaced.
M*4&55*89*9%J/,(a%W7'3
TORCH®F7TC
BGID@6- Using an incorrect spark plug
may damage the Engine.
4. When installing a new spark plug,
adjust the plug’s gap to the specification on the
Specifications chart. Do not pry against the
electrode, the spark plug can be damaged.
5. Install the new spark plug or
the cleaned spark plug into the Engine.
• Y,#a*$S#$L7*:
Finger-tighten until the gasket
contacts the cylinder head,
then tighten about 1/2-2/3 turn more.
• B&8S3,#a*$S#$L7*:
Finger-tighten until the plug
contacts the cylinder head,
then tighten about 1/16 turn more.
BGID@6- Tighten the spark plug properly.
D2%7&&#*, the spark plug will cause the
Engine to overheat.
D2%&Q*($"3.$*8*9, the threads in the
engine block will be damaged.
6. Apply dielectric spark plug boot protector
(not included) to the end of the spark plug
and reattach the cap securely.
E&83SI*(5%J$&(,3*
When the equipment is to remain idle for longer than
20 days, prepare the Engine for storage as follows:
1. @E6ABDBY-
Wait for Engine to cool, then clean Engine with
dry cloth. BGID@6- P&%8&$%47*,8%'#"83%),$*(1
The water will gradually enter the Engine
and cause rust damage. Apply a thin coat
of rust preventive oil to all metal parts.
2. O?6E-
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 12.
XAMBDBYf IG%WM6!6BI%J6MDG?J%
DBb?MF%OMGH%ODM6-
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. E?ZMD@AIDGB-
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. JIGMAY6%AM6A-
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.
BGID@6- 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. AOI6M%JIGMAY6-
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.

Page 14 O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1 ITEM 57531
JAO6IF J6I?W DBJIAEEAIDGB HADBI6BAB@6
I(&'+7*#.&&$"83
W(&+7*5 W&##"+7*%@,'#*# W(&+,+7*%J&7'$"&8#
Engine will not start FUEL RELATED:
1. No fuel in tank or fuel valve closed.
2. Choke not in START position, cold engine.
3. Gasoline with more than 10% ethanol used.
(E15, E20, E85, etc.)
4. Low quality or deteriorated, old gasoline.
5. Carburetor not primed.
6. Dirty fuel passageways.
7. Carburetor needle stuck.
Fuel can be smelled in the air.
8. Too much fuel in chamber. This can be
caused by the carburetor needle sticking.
9. Clogged Fuel Filter.
FUEL RELATED:
1. Fill fuel tank with fresh 91+ octane
stabilizer-treated unleaded gasoline and
open fuel valve.%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
2. Move Choke to START position.
3. Clean out ethanol rich gasoline from fuel
system. Replace components damaged by
ethanol. Use fresh 91+ octane stabilizer-
treated unleaded gasoline only. %%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
4. Use fresh 91+ octane stabilizer-treated
unleaded gasoline.%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
5. Pull on Starter Handle to prime.
6. Clean out passageways using
fuel additive. Heavy deposits
may require further cleaning.
7. Y*8$7L tap side of carburetor float
chamber with screwdriver handle.
8. Turn Choke to RUN position.
Remove spark plug and pull the start
handle several times to air out the
chamber. Reinstall spark plug and
set Choke to START position.
9. Replace Fuel Filter.
IGNITION (SPARK) RELATED:
1. Spark plug cap not connected securely.
2. Spark plug electrode wet or dirty.
3. Incorrect spark plug gap.
4. Spark plug cap broken.
5. Incorrect spark timing or
faulty ignition system.
IGNITION (SPARK) RELATED:
1. Connect spark plug cap properly.
2. Clean spark plug.
3. Correct spark plug gap.
4. Replace spark plug cap.
5. Have qualified technician diagnose/
repair ignition system.
COMPRESSION RELATED:
1. Cylinder not lubricated.
Problem after long storage periods.
2. Loose or broken spark plug.
(Hissing noise will occur
when trying to start.)
3. Loose cylinder head or damaged
head gasket. (Hissing noise will
occur when trying to start.)
4. Engine valves or tappets
mis-adjusted or stuck.
COMPRESSION RELATED:
1. Pour tablespoon of oil into
spark plug hole. Crank engine a
few times and try to start again.
2. Tighten spark plug.
If that does not work, replace spark plug.
If problem persists, may have
head gasket problem, see #3.
3. Tighten head.
If that does not remedy problem,
replace head gasket.
4. Have qualified technician adjust/
repair valves and tappets.
O&77&)%,77%#,2*$L%/(*4,'$"&8#%).*8*Q*(%9",38&#"83%&(%#*(Q"4"83%$.*%*R'"/5*8$%&(%*83"8*1

Page 15O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1ITEM 57531
JAO6IFJ6I?WDBJIAEEAIDGBHADBI6BAB@6
W(&+7*5 W&##"+7*%@,'#*# W(&+,+7*%J&7'$"&8#
Engine misfires 1. Spark plug cap loose.
2. Incorrect spark plug gap or
damaged spark plug.
3. Defective spark plug cap.
4. Old or low quality gasoline.
5. Incorrect compression.
1. Check cap and wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug cap.
4. Use only fresh 91+ octane stabilizer-treated
unleaded gasoline.%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
5. Diagnose and repair compression.
(Use 683"8*%)"77%8&$%#$,($-%
@GHWM6JJDGB%M6EAI6P section.)
Engine stops
suddenly
1. Fuel tank empty or full of impure or low
quality gasoline.
2. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.
3. Faulty magneto.
4. Disconnected or improperly
connected spark plug cap.
1. Fill fuel tank with fresh 91+ octane
stabilizer-treated unleaded gasoline.%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
2. Test/replace fuel tank cap.
3. Have qualified technician service magneto.
4. Secure spark plug cap.
Engine stops when
under heavy load
1. Dirty air filter
2. Engine running cold.
1. Clean element.
2. Allow engine to warm up prior
to operating equipment.
Engine knocks 1. Old or low quality gasoline.
2. Engine overloaded.
3. Incorrect spark timing, deposit buildup,
worn engine, or other mechanical problems.
1. Fill fuel tank with fresh 91+ octane
stabilizer-treated unleaded gasoline. %%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
2. Do not exceed equipment’s load rating.
3. Have qualified technician
diagnose and service engine.
Engine backfires 1. Impure or low quality gasoline.
2. Engine too cold.
3. Intake valve stuck or overheated engine.
4. Incorrect timing.
1. Fill fuel tank with fresh 91+ octane
stabilizer-treated unleaded gasoline. %%
P&%8&$%'#*%3,#&7"8*%)"$.%5&(*%$.,8%
>ij%*$.,8&7%c6>;N%6hiN%6T;N%*$41d1
2. Use cold weather fuel and
oil additives to prevent backfiring.
3. Have qualified technician
diagnose and service engine.
4. Check engine timing.
After sudden
impact, engine will
run, but equipment
will not operate
Shaft key or other shear pin
broken by impact to disconnect
engine and limit damage.
Have qualified technician check and replace
broken shaft key or other shear pins.
O&77&)%,77%#,2*$L%/(*4,'$"&8#%).*8*Q*(%9",38&#"83%&(%#*(Q"4"83%$.*%*R'"/5*8$%&(%*83"8*1

Page 16 O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1 ITEM 57531
JAO6IF J6I?W DBJIAEEAIDGB HADBI6BAB@6
W,($#%E"#$%,89%P",3(,5#
WE6AJ6%M6AP%I[6%OGEEGXDBY%@AM6O?EEF
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.
W,($#%E"#$
W,($ P*#4("/$"&8 g$L1
1 Crankcase 1
2 Ball Bearing 2
3 Oil Seal 2
4 Recoil Starter Fan 1
5 Flywheel Assembly 1
6 Bolt M6 x 16 4
7 Intake Manifold 1
8 Drain Plug Bolt 2
9 Drain Plug Washer 2
10 Crankcase Cover Dowel Pin 2
11 Piston 1
12 Piston Ring Set 1
13 Connecting Rod Assembly 1
14 Piston Pin 1
15 Piston Clip 2
16 Crankcase Cover Assembly 1
17 Oil Plug 1
18 Dipstick 1
19 Cylinder Head 1
20 Intake Valve 1
21 Exhaust Valve 1
22 Valve Seal 1
23 Valve Spring 2
24 Air Deflector 1
25 Valve Spring Seat 2
26 Oil Cap 1
27 Clip 1
28 Stop 1
29 Rocker Arm 2
30 Bolt 2
31 Carburetor Assembly 1
32 Locking Clip 4
33 Air Deflector 1
34 Fuel Pump Installation Plate 1
35 Nut M6 2
36 Pin 2
W,($ P*#4("/$"&8 g$L1
37 Crankshaft Assembly 1
38 Valve Lifter 2
39 Crankcase Cover Gasket 1
40 Camshaft Assembly 1
41 Dowel Pin 2
42 Bolt M8 x 30 6
43 Cylinder Head Gasket 1
44 Bolt M8 x 60 4
45 Spark Plug 1
46 Push Rod 2
47 Rocker Shaft 2
48 Bolt M6 x 12 13
49 Cylinder Head Cover Gasket 1
50 Cylinder Head Cover 1
51 Air Shield 1
52 Bolt M6 x 20 1
53 Bolt M6 x 30 3
54 Bolt M6 x 8 1
55 Starter Pulley 1
56 Nut 1
57 Ignition Coil Assembly 1
58 Bolt M6 x 25 2
59 Intake Port Gasket 1
60 Switch Assembly 1
61 Recoil Starter Assembly 1
62 Bolt M6 x 36 2
63 Carburetor Spacer 1
64 Nut M6 2
65 Intake Manifold Gasket 1
66 Screen 1
67 Bolt 5/16-24 UNF 1
68 Flat Key 1
69 Crankshaft Washer 1
70 Nut M8 2
71 Spring Washer M8 2
72 Exhaust Port Gasket 1
M*4&(9%W(&9'4$l#%J*(",7%B'5+*(%[*(*-%
B&$*- If product has no serial number, record month and year of purchase instead.
B&$*- Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 193175416902 when ordering parts.

Page 17O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1ITEM 57531
JAO6IFJ6I?WDBJIAEEAIDGBHADBI6BAB@6
A##*5+7L%P",3(,5

Page 18 O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1 ITEM 57531
JAO6IF J6I?W DBJIAEEAIDGB HADBI6BAB@6
H&'8$"83%[&7*%P",3(,5
B&$*- Not to scale.



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Page 19O&(%$*4.8"4,7%R'*#$"&8#N%/7*,#*%4,77%>STTTSTUUS;<V<1ITEM 57531
JAO6IFJ6I?WDBJIAEEAIDGBHADBI6BAB@6
W&)*(%I,a*SG22%P",3(,5
B&$*- Not to scale.

;0>UShm%?BO

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

> 1 <V % 

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hUU<<%A3&'(,%M&,9%%n%%@,7,+,#,#N%@A%V>=ih%%n%%>STTTSTUUS;<V<
E"5"$*9%Vi%P,L%X,((,8$L
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.