MAX PERFORMANCE
GAS ENGINE
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email our technical support at: [email protected]
email our engine support at: [email protected]
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.
459cc OHV
HORIZONTAL SHAFT
58383
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. 24j
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-800-444-3353 as soon as possible.
Copyright
©
2022 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.
Page 2 For technical questions, please call 1-800-444-3353. 58383
Table of Contents
Specifications ............................................................2
Safety ........................................................................3
Setup .........................................................................6
Operation ................................................................... 8
Maintenance .............................................................12
Troubleshooting ........................................................ 17
Parts List and Diagrams ...........................................18
Warranties ................................................................22
Specifications
Displacement 459 cc
Engine Type
Horizontal Single Cylinder 4 stroke OHV
EPA phase III compliant
Cooling System Forced air cooled
Starting System Electric / Recoil
Fuel
Type
87+ octane stabilizer treated
unleaded gasoline
Capacity 1.85 Gallon
Engine Oil
Type SAE
10W-30 above 32° F
5W-30 at 32° F or below
Capacity 1.16 Quart
Low Oil
Shutdown
Yes
Maximum Horsepower 15.8 HP @ 3600 RPM
Bore x Stroke 92 mm x 69 mm
Compression Ratio 8.8:1
Rotation viewed from PTO
(power takeoff - the output shaft)
Counterclockwise
Shaft
Shaft 1″ x 3.5″
Keyway 1/4″ (6.35 mm)
End Tapped 3/8″– 24 UNF
Spark Plug
Type NHSP
®
/ Torch
®
F7TC
Gap 0.028″– 0.031″
Valve Clearance
Intake 0.0020″– 0.0039″
Exhaust 0.0012″– 0.0031″
Maximum Speed No Load 3800 RPM
The emission 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.
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SaFeTyOperaTiOnMainTenanCe SeTup
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.
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 property or Statement
rpM
Revolutions Per Minute
Hp
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.
Safety Warnings
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.
SaVe THeSe inSTruCTiOnS
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SaFeTy OperaTiOn MainTenanCeSeTup
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.
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.
Operating precautions
1. 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.
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 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.
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 the tool from rolling, slipping, and tilting.
9. Industrial applications must follow
OSHA requirements.
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.
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.
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.
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.
17. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the equipment in unexpected situations.
18. Use this equipment with both hands
only. Using equipment with only one hand
can easily result in loss of control.
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.
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SaFeTyOperaTiOnMainTenanCe SeTup
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.
22. Keep the equipment, engine, and
surrounding area clean at all times.
23. Do not refill the fuel tank while the
engine is running or hot.
24. 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.
25. Do not operate the equipment with known
leaks in the engine’s fuel system.
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.
Service precautions
1. Before service, maintenance, or cleaning:
a. Turn the engine switch to its “OFF” position.
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.
7. Store equipment out of the reach of children.
8. Follow scheduled engine and
equipment maintenance.
refueling:
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.
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.
SaVe THeSe inSTruCTiOnS.
Operating precautions (continued)
Page 6 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
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.
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! TO preVenT SeriOuS inJury: DO nOT inSTaLL THiS enGine On a VeHiCLe.
WarninG! inSTaLL THiS enGine aCCOrDinG TO eQuipMenT inSTruCTiOnS BeFOre uSe.
WarninG! TO preVenT SeriOuS inJury: if you do not connect a battery to the positive battery cable,
wrap its terminal securely with electrical tape (sold separately).
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.
Battery Setup instructions
1. Place a fully charged, lead-acid 12 volt,
300 CCa, 36 ah battery (not included) in
a stable, flat location near the engine.
2. Only use cables sized to match their length
according to the following chart:
Cable Gauge
(lower gauge numbers
mean thicker cables)
Maximum
Cable Length
6 5′
4 7′
2 12′
3.
Starting relay
Motor Starter assembly
Attach the positive cable from the positive
battery terminal to the Positive Terminal on
the starter solenoid (uncovered terminal),
shown above. Connect cable securely to
prevent disconnection and short circuits.
4. Attach the negative cable to the
negative battery terminal.
5. Connect the negative cable securely to one
of the engine mounting bolts, as shown in
the diagram below. Connect cable securely to
prevent disconnection and short circuits.
Connect negative
Battery Cable to a
Mounting Bolt
6. Coat the terminals and cable ends with
a corrosion-preventive coating.
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SaFeTyOperaTiOnMainTenanCe SeTup
engine Controls
I
O
ST
ART
Starter
Handle
Oil Drain plug
air Filter
Fuel Valve
Choke
Fuel Cap
Throttle
engine
Switch
Serial
number
Location
(Write on front
cover of manual.)
Dipstick
Starter
Muffler
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SaFeTy OperaTiOn MainTenanCeSeTup
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.
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
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.
Engine will not start with low or no engine oil.
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 turning it counterclockwise,
and wipe it off with a clean, lint free rag.
4.
Full level
Full level
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.
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 Grade chart on
page 13 in the Maintenance 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.
Engine will shut off if engine oil level is too low.
Page 9For technical questions, please call 1-800-444-3353.58383
SaFeTyOperaTiOnMainTenanCe SeTup
Checking and Filling Fuel
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.
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 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.
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.
Starting the engine
Before Starting the engine
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 stabilizer-treated unleaded gasoline and oil.
d. read the equipment Operation section in the equipment manual.
Page 10 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
Starting the engine
1. To start a cold engine, move the Choke Lever to the
START position.
To restart a warm engine, leave the
Choke Lever in the RUN position.
2. Open the Fuel Valve.
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.
4.
STarT run
OFF
ON
For ManuaL STarT
a. Turn the Engine Switch to ON.
B. 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.
Note: Do not let the Starter Handle
snap back against the Engine. Hold it
as it recoils so it doesn't hit the Engine.
note: If Engine does not start,
check engine oil level. Engine will
not start with low or no engine oil.
i
O
STarT
For eLeCTriC STarT
Turn the Engine Switch to START.
note: To prolong starter life, use
short starting cycles (5 seconds
maximum). Then wait one minute
before attempting to start again.
START
i
O
STarT
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5. 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.
note: Moving the Choke Lever too
fast could stall the engine.
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.
6. Adjust the Throttle as needed.
7. 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.
• Do not operate the engine at its maximum speed.
c. The maintenance break-in period will last about 20 hours of use. After this period:
• Change the engine oil.
Under normal operating conditions subsequent maintenance follows the schedule
explained in the MAINTENANCE AND SERVICING section.
Stopping the engine
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 or Speed Control
Lever to SLOW (the “turtle”).
b. Turn the Engine Switch OFF.
c. Close the Fuel Valve.
STarT run
i
O
STarT
OFF
OFF
ON
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SaFeTy OperaTiOn MainTenanCeSeTup
Maintenance
WarninG
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
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.
procedure
Before
each use
Monthly or
every 20
hr. of use
every 3 mo. or
50 hr. of use
every 6 mo. or
100 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
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.
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SaFeTyOperaTiOnMainTenanCe SeTup
Checking and Filling Fuel
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.
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 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.
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 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 oil is recommended for
general use.
The SAE Viscosity Grade chart shows other
viscosities to use in different average temperatures.
10W-30
30
5W-30
-20 0 20 40 60 80 100°F
Sae Viscosity Grades
average outdoor temperature
8. Thread the dipstick back in clockwise.
nOTiCe: Do not run the engine with too little oil.
Engine will not start with low or no engine oil.
Page 14 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
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. Install the cleaned filter. Secure the
Air Cleaner Cover before use.
Spark plug Maintenance
1.
Spark
plug
Cap
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.
Use only NHSP
®
/
Torch
®
F7TC spark plug.
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 Technical
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 tighten
about 1/2-2/3 turn more.
Non-gasket-style: Finger-tighten until
the plug contacts the 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.
6. Apply dielectric spark plug boot protector
(not included) to the end of the spark
plug and reattach the wire securely.
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SaFeTyOperaTiOnMainTenanCe SeTup
Storage
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 corrosion damage. Apply a thin coat of
corrosion preventive oil to all metal parts.
2. FueL:
Gasoline Treatment / Draining the Fuel Tank
• To protect the Fuel Tank during storage,
fill the tank with fresh 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 13.
• Aged gasoline that has not been treated with
stabilizer ahead of time must be safely drained
away and not run through the Engine.
WarninG! TO preVenT SeriOuS
inJury FrOM Fire:
Drain 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.
Draining the Carburetor
• After closing the Fuel Valve, place an
appropriate container under the Carburetor
and carefully remove the Drain Bolt
from the bottom of the Carburetor Bowl,
allowing the fuel to drain completely.
Replace the Drain Bolt after draining.
WarninG! To prevent serious
injury and fire, close the Fuel Valve
before draining the Carburetor.
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).
3. BaTTery:
Disconnect battery cables (if equipped).
Disconnect the Negative battery cable first,
then the Positive battery cable. Recharge
batteries monthly while in storage.
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.
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.
Page 16 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
Troubleshooting
problem possible Causes probable Solutions
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 87+ octane stabilizer-
treated unleaded gasoline and open fuel
valve.
Do not use gasoline with more than
10% ethanol (e15, e20, e85, etc.).
2. Move Choke to START position.
3. Clean out ethanol rich gasoline from fuel
system. Replace components damaged by
ethanol. Use fresh 87+ octane stabilizer-
treated unleaded gasoline only.
Do not use gasoline with more than
10% ethanol (e15, e20, e85, etc.).
4. Use fresh 87+ octane stabilizer-treated
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (e15, e20, e85, etc.).
5. Pull on Starter Handle to prime.
6. Clean out passageways using fuel additive.
Heavy deposits may require further cleaning.
7. Gently 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. Engine switch in OFF position.
2. Spark plug cap not connected securely.
3. Spark plug electrode wet or dirty.
4. Incorrect spark plug gap.
5. Spark plug cap broken.
6. Circuit breaker tripped.
7. Incorrect spark timing or faulty ignition system.
IGNITION (SPARK) RELATED:
1. Turn engine switch to ON position.
2. Connect spark plug cap properly.
3. Clean spark plug.
4. Correct spark plug gap.
5. Replace spark plug cap.
6. Reset circuit breaker. Check wiring and
starter motor if breaker continues to trip.
7. 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.
ENGINE OIL RELATED:
1. Low engine oil.
2. Engine mounted on slope,
triggering low oil shutdown.
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.
ENGINE OIL RELATED:
1. Fill engine oil to proper level.
Check engine oil before EVERY use.
2. Operate engine on level surface.
Check engine oil level.
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
Page 17For technical questions, please call 1-800-444-3353.58383
SaFeTyOperaTiOnMainTenanCe SeTup
problem possible Causes probable Solutions
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 87+ octane stabilizer-treated
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (e15, e20, e85, etc.).
5. Diagnose and repair compression.
(Use engine will not start:
COMpreSSiOn reLaTeD section.)
Engine stops
suddenly
1. Fuel tank empty or full of impure or low quality
gasoline.
2. Low oil shutdown.
3. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.
4. Faulty magneto.
5. Disconnected or improperly
connected spark plug cap.
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. Fill engine oil to proper level.
Check engine oil before EVERY use.
3. Test/replace fuel tank cap.
4. Have qualified technician service magneto.
5. 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 87+ octane stabilizer-
treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (e15, e20, e85, etc.).
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 87+ octane stabilizer-
treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (e15, e20, e85, etc.).
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.
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
pLeaSe reaD THe FOLLOWinG CareFuLLy
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.
Page 18 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
part Description Qty.
1 Flange Hex Bolt 9
2 Cylinder Head Cover 1
3 Breather Tube 1
4 Breather Chamber Packing 1
5 Breather Chamber Cap 1
6 Flange Hex Bolt 8
7 Cylinder Head Cover Gasket 1
8 Flange Hex Bolt 4
9 Stud 2
10 Outlet Gasket 1
11 Muffler 1
12 Spark Plug 1
13 Cylinder Head 1
14 Cylinder Head Gasket 1
15 Pin 2
16 Valve Rocker Shaft 2
17 Valve Rocker 2
18 Valve Adjustment Cap 2
19 Valve Lock 4
20 Valve Spring Retainer 2
21 Valve Spring 2
22 Valve Spring Seat 1
23 Valve Oil Seal 1
24 Valve Set 1
25 Flange Hex Bolt 7
26 Oil Seal 2
27 Crankcase Cover 1
28 Engine Oil Strainer 1
29 Governor Gear 1
30 Compression Spring 1
31 Steel Ball 1
32 Pin 2
33 Seal Ring 1
34 Fuel Tank Cap 1
35 Fuel Strainer 1
36 Fuel Tank Breather Valve 1
37 Hose Clip 2
38 Oil Level Alarm 1
39 Engine Oil Protector 1
40 Starter Control Box 1
41 Oil Pump Components 1
42 Crankcase Cover Gasket 1
43 Throttle Handle Assembly 1
44 Push Rod 2
45 Valve Lifter 2
46 Camshaft Assembly 1
47 Connecting Rod 1
48 Balancing Shaft Assembly 1
49 Crankshaft 1
50 Pin 2
51 Seal Ring 1
part Description Qty.
52 Governor Spring 1
53 Speed Regulating Bracket 1
54 Oil Seal 1
55 Pin Clip 1
56 Speed Regulating Arm 1
57 Flat Washer 1
58 Oil Dipstick 1
59 Crankcase Body 1
60 Charging Current Armature 1
61 Breather Tube 1
62 Flange Hex Bolt 2
63 Cable Cleat 1
64 Oil Drain Bolt 1
65 Flat Washer 1
66 Fuel Tank Bracket 1
67 Fuel Tank Bracket 1
68 Flange Hex Bolt 4
69 Hex Flange Nut 2
70 Rubber Gasket 2
71 Piston Pin Clip 2
72 Piston 1
73 Piston Pin 1
74 Piston Ring Set 1
75 Stud 2
76 Carburetor Gasket 1
77 Carburetor Heat Insulating Pad 1
78 Carburetor Gasket 1
79 Air Deflector 1
80 Carburetor 1
81 Throttle Return Spring 1
82 Throttle Rod 1
83 Carburetor Gasket 1
84 Air Filter 1
85 Hex Flange Nut 2
86 Ignition Coil 1
87 Flange Hex Bolt 5
88 Flywheel Assembly 1
89 Impeller 1
90 Starter Pulley 1
91 Hex Flange Nut 1
92 Manual Starting Assembly 1
93 Flange Hex Bolt 8
94 Wire Clip 1
95 Nut 2
96 Fuel Hose 1
97 Fuel Tank 1
98 Starter Motor 1
99 Flange Hex Bolt 2
100 Clip 1
101 Clip 1
parts List and Diagrams
parts List
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. Specify UPC 193175438157 when ordering parts.
Page 19For technical questions, please call 1-800-444-3353.58383
SaFeTyOperaTiOnMainTenanCe SeTup
assembly Diagram
Page 20 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
Mounting Hole Diagram
note: Not to scale.
5.67 in. / 144 mm
4 in. / 103 mm
3.54 in. / 90 mm
7.7 in. / 195.5 mm
0.47
in. / 12 mm
5.2 in. / 132 mm
0.67 in. / 17 mm
1.14 in. /29 mm
Ø 0.43 in. / 11 mm
Page 21For technical questions, please call 1-800-444-3353.58383
SaFeTyOperaTiOnMainTenanCe SeTup
power Take-Off Diagram
note: Not to scale.
0.25 in. / 6.35 mm
Ø 1 in. / 25.4 mm
0.866 in. / 21.9 mm
3/8–24unF–2B
0.63 in. / 16.2 mm
2.2 in. / 56 mm
3.48 in. / 88.5 mm
1.1 in. / 28 mm
Ø 1.37 in. / 35 mm
5.25 in. / 133.5 mm
3.52 in. / 89.45mm
Ø 5.75 in. / 146 mm
Ø 4.96 in. /
126.5 mm
Ø 6.5 in. /
165.1 mm
6 x 5 / 16–24UNF–28
Page 22 For technical questions, please call 1-800-444-3353. 58383
SaFeTy OperaTiOn MainTenanCeSeTup
Warranties
Limited 90 Day Warranty (retail)
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, EXCEPT FOR THE EMISSIONS CONTROL SYSTEM WARRANTY BELOW.
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 23For technical questions, please call 1-800-444-3353.58383
SaFeTyOperaTiOnMainTenanCe SeTup
emissions Control System Warranty
In accordance with U.S. Environmental Protection Agency (EPA) regulations, Harbor Freight Tools (HFT) is
pleased to explain the emissions control system warranty on your Model Year [Model Year] engine/equipment in
addition to the Retail Warranty above. HFT warrants that the emissions control system on your engine is designed,
built, and equipped so that it conforms to the United States Environmental Protections Agency’s (EPA) emissions
requirements in effect at the time of manufacture. HFT also warrants that the emissions control system on your
engine will be free from defects in material and workmanship for two (2) years, provided there has been no improper
maintenance, misuse, or abuse of your engine.
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.
WHaT We WiLL DO
Where a warrantable condition exists, HFT will repair or replace, at our option, any emissions-related part on
your engine if it becomes defective, malfunctions, or otherwise fails to conform with this warranty under normal use
and service during the two (2) year term of this warranty at no cost to you, including diagnosis, parts and labor. This
warranty applies to the original purchaser and any subsequent owner within the two year warranty period.
WHaT iS COVereD?
The following parts are examples of components of the emissions control system and are covered by this
two (2) year warranty. For a full list of emissions control components covered by this warranty, please see 40 CFR
§1068, Appendix I.
1. Fuel Metering System
a. Carburetor and its internal parts.
b. Fuel pump (if so equipped).
c. Cold start enrichment system.
2. Air Induction System
a. Intake pipe/manifold.
b. Air cleaner.
3. Ignition System
a. Spark plug.
b. Magneto ignition system.
4. Catalyst System (if so equipped)
a. Exhaust pipe stud.
b. Muffler.
c. Catalytic converter (if so equipped).
5. Miscellaneous Items Used in Above Systems
a. Vacuum, temperature and time sensitive
valves and switches.
b. Hoses, belts, connectors, and assemblies.
This warranty does not cover normal maintenance services or replacement of maintenance items such as filters,
oils, or spark plugs.
WHaT yOu MuST DO TO OBTain WarranTy SerViCe
As the engine owner, you are responsible for the performance of the required maintenance listed in your
Owner’s Manual. HFT may deny you warranty coverage if your engine or a part has failed due to abuse (including
failure to follow the fuel use instructions contained in this manual), neglect, improper maintenance, or unapproved
modifications.
In order to obtain warranty repair or replacement, you may either (a) contact HFT product support
at 1-800-444-3353 or [email protected]; or (b) bring the engine/equipment to your nearest
Harbor Freight Tools retail store. When going to the retail store or contacting product support, you must indicate
the specific emissions control part or defect that you are claiming and the date this was originally purchased.
The nearest Harbor Freight Tools retail store can be found on the internet at https://www.harborfreight.com.
26677 agoura road • Calabasas, Ca 91302 • 1-800-444-3353
