Harbor Freight Tools 68122 User's Manual

173cc Vertical Engine
68122 / 68123 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.
When unpacking, make sure that the product is intact and undamaged. If any parts are missing or broken,
please call 1-800-520-0882 as soon as possible.
Record Product’s Serial Number Here:
(See Serial Number Location on page 7.)
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.
Visit our website at: http://www.harborfreight.com
Copyright© 2010 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.
Specifications
Engine Type
Cooling System
Type
Capacity
Fuel
Type SAE
Engine Oil
Capacity
Run Time @ 50% Load
with full tank
Sound Level
Bore x Stroke
Displacement
Compression Ratio
Rotation viewed from PTO
Vertical Single Cylinder 4 stroke OHV
Forced air cooled
87+ octane unleaded gasoline
1.16 Quarts
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
(power takeoff - the output shaft)
Shaft dia.
7/8” x 3.16”
Keyway
Shaft
3/16” (4.76 mm)
End Tapped
3/8 - 24
NGK®
Type
Spark Plug
Valve Clearance
Speed
Page 2
Gap
Intake
Exhaust
Idle
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 1-800-520-0882.
Vertical Engine
Save This Manual
Symbol Definitions
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.
Safety Warnings
In this manual, on the labeling, and all other
information provided with this product:
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.
DANGER indicates a hazardous situation which, if
not avoided, will result in death or serious injury.
WARNING indicates a hazardous situation which, if
not avoided, could result in death or serious injury.
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury.
NOTICE is used to address practices
not related to personal injury.
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.
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.
SAVE THESE INSTRUCTIONS
CAUTION, without the safety alert symbol, is used
to address practices not related to personal injury.
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For technical questions, please call 1-800-520-0882.
Page 3
Set up Precautions
Operating 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.
1.
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.
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.
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.
NEVER use inside a home or garage, EVEN IF doors
and windows are open.
6. Use only lubricants and fuel recommended in
the Specifications chart of this manual.
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.
Page 4
For technical questions, please call 1-800-520-0882.
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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.
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.
Vertical Engine
22. Keep the equipment, engine, and
surrounding area clean at all times.
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.
24. Do not operate the equipment with known
leaks in the engine’s fuel system.
25. 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.)
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.
For technical questions, please call 1-800-520-0882.
Page 5
Service Precautions
1. Before service, maintenance, or cleaning:
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.
Page 6
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.
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.
SAVE THESE
INSTRUCTIONS.
For technical questions, please call 1-800-520-0882.
Vertical Engine
Engine Components
Fuel Cap
Priming
Bulb
Starter
Handle
Dipstick
Muffler
Air
Filter
Brake
Arm
Choke
XXXXXXXXXX
Serial
Number
Location
(Write on front
cover of manual.)
Vertical Engine
For technical questions, please call 1-800-520-0882.
Page 7
Set Up
Model 68123: 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.
Models 68122: 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.
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.
4. Use 3/8” diameter, coarse threaded, hardened,
stainless steel Bolts, Lock Washers, and Washers (not
included) of appropriate length to secure the Engine to
the mower.
Make sure the hardware does not
contact moving parts.
5. 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
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.
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.
1. IMPORTANT: If you have any doubts about your
ability to perform the following procedures, have a
qualified service technician perform the installation.
Brake
Cable
Brake
Cable
Bracket
Choke
Choke
Cable
2. Install this engine on a lawn mower only.
Bracket
and
Bolt
3. Set the Engine upright on the mower, and align at
least three 3/8” diameter coarse threaded engine
mounting holes with mower mounting holes.
6. Attach the end of the mower’s Choke Cable
to the Choke. Use the Bracket and Bolt to
secure its sheath in place as shown above.
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.
7. This engine is set to a single speed
that should not be adjusted.
Page 8
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.
For technical questions, please call 1-800-520-0882.
Vertical Engine
Checking and Filling Fuel
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
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.
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
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.
1. Make sure the engine is stopped and is level.
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.
3. If needed, fill the Fuel Tank to about 1 inch
under the fill neck of the Fuel Tank with 87
octane or higher unleaded gasoline.
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.
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 fuel and oil.
d. Read the Equipment Operation
section in the equipment manual.
Full level
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.
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 Service section shows other
viscosities to use in different average temperatures.)
5. Thread the Dipstick back in clockwise.
CAUTION! Do not run the engine with too little
oil. The engine will be permanently damaged.
Vertical Engine
For technical questions, please call 1-800-520-0882.
Page 9
Starting
Note: 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.
1. Press the Priming Bulb 2-3 times to prime the engine.
2. If the engine is cold, adjust the Mower’s choke control
to the CHOKE (START/CLOSED) position.
1
2
Note: Location, operation, and design of the choke control
will vary from manufacturer to manufacturer. Adjust the
control so that it pulls the choke cable to close the choke.
3
3. Hold the mower’s brake handle closed.
Page 10
For technical questions, please call 1-800-520-0882.
Vertical Engine
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.
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,
if the Mower’s choke control is in the CHOKE
(START/CLOSED) position, move the choke control
very slowly to its RUN (OPEN) position.
4
5
NOTE: Moving the Choke Lever too fast could stall the engine.
IMPORTANT: Allow the engine to run at no load for a minute or two with no load
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:
• Change the engine oil.
Under normal operating conditions subsequent maintenance follows the
schedule explained in the MAINTENANCE AND SERVICING section.
Stopping the Engine
To stop the engine, release the brake handle.
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For technical questions, please call 1-800-520-0882.
Page 11
Service
WARNING
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.
Maintenance Procedures
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 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
*
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.
Page 12
For technical questions, please call 1-800-520-0882.
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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.
Full level
3. If needed, fill the Fuel Tank to about 1 inch
under the fill neck of the Fuel Tank with 87
octane or higher unleaded gasoline.
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.
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.
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.
Air Filter Element Maintenance
Engine Oil Change
2. Cleaning:
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.
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.
SAE Viscosity Grade
1. Remove the air filter cover and the air filter elements
and check for dirt. Clean or replace as described below.
• For “paper” filter elements:
To prevent injury from dust and debris, wear ANSIapproved 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.
If this does not get the filter clean, replace it.
• 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 new filter or the cleaned filter. Secure the Air Cleaner Cover before use.
30
10W-30
5W-30
-20
0
20
40
60
80
Average outdoor temperature
Vertical Engine
100°F
For technical questions, please call 1-800-520-0882.
Page 13
Spark Plug Maintenance
rust damage.
Apply a thin coat of rust preventive oil to all metal parts.
2. FUEL:
Spark
Plug
Cap
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 draining fuel. Do not smoke.
a. Place a funnel leading to a proper gasoline
container below the carburetor.
1. Disconnect spark plug cap from end of plug.
Clean out debris from around spark plug.
2. Using a spark plug wrench, remove the spark plug.
3. Inspect the spark plug:
If the electrode is oily, clean it using a clean, dry
rag. If the electrode has deposits on it, polish it
using emery paper. If the white insulator is cracked
or chipped, the spark plug needs to be replaced.
Recommended Spark Plugs
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 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 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
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
Page 14
Drain Plug
b. Remove the drain bolt from the bottom of the
carburetor bowl and allow the fuel to drain.
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.
5. AFTER STORAGE:
Before starting the engine 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 properly.
For technical questions, please call 1-800-520-0882.
Vertical Engine
Troubleshooting
Problem
Engine will not start
Possible Causes
Probable Solutions
MOWER ENGINE SPECIFIC:
1. Brake Handle not held or brake
cable not connected properly.
2. Mower on top of grass.
MOWER ENGINE SPECIFIC:
1. Make sure brake handle is held down
and brake cable is properly adjusted.
2. Start mower atop clear area free
of loose objects and grass.
FUEL RELATED:
1. No fuel in tank.
2. Low quality or deteriorated, old gasoline.
3. Carburetor not primed.
4. Dirty fuel passageways.
FUEL RELATED:
1. Fill fuel tank.
2. Use fresh 87+ octane unleaded gasoline.
3. Press priming bulb before starting cold engine.
4. Clean out passageways using fuel additive.
Heavy deposits may require further cleaning.
5. Gently tap side of carburetor float
chamber with screwdriver handle.
6. Turn Choke to RUN (OPEN) position.
Remove spark plug and pull the start
handle several times to air out the chamber.
Reinstall spark plug and set Choke to
CHOKE (START/CLOSED) position.
5. Carburetor needle stuck. Fuel
can be smelled in the air.
6. Too much fuel in chamber. This can be
caused by the carburetor needle sticking.
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.
COMPRESSION RELATED:
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 2. Tighten spark plug. If that does not work,
will occur when trying to start.)
replace spark plug. If problem persists,
may have head gasket problem, see #3.
3. Loose cylinder head or damaged
3. Tighten head. If that does not remedy
head gasket. (Hissing noise will
problem, replace head gasket.
occur when trying to start.)
4. Engine valves or tappets
4. Have qualified technician diagnose/
mis‑adjusted or stuck.
repair ignition system.
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
Vertical Engine
For technical questions, please call 1-800-520-0882.
Page 15
Problem
Engine misfires
Engine stops
suddenly
Possible Causes
Probable Solutions
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 wire connections.
2. Re-gap or replace spark plug.
1. Low oil shutdown.
1. Fill engine oil to proper level. Check
engine oil before EVERY use.
2. Fill fuel tank with fresh 87+
octane unleaded gasoline.
3. Test/replace fuel tank cap.
2. Fuel tank empty or full of impure
or low quality gasoline.
3. Defective fuel tank cap creating
vacuum, preventing proper fuel flow.
4. Faulty magneto.
5. Disconnected or improperly
connected spark plug cap.
3. Replace spark plug cap.
4. Use only fresh 87+ octane unleaded gasoline.
5. Diagnose and repair compression.
(Use Engine will not start:
COMPRESSION RELATED section.)
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 or replace element.
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 unleaded gasoline.
2. Do not exceed equipment’s load rating.
3. Have qualified technician diagnose
and service engine.
2. Engine overloaded.
3. Incorrect spark timing, deposit
buildup, worn engine, or other
mechanical problems.
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 unleaded gasoline.
2. Use cold weather fuel and oil
additives to prevent backfiring.
3. Have qualified technician diagnose
and service engine.
4. Check engine timing.
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
Page 16
For technical questions, please call 1-800-520-0882.
Vertical Engine
Emission Control System
Warranty
Warranties
Limited 1 Year / 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that
its products meet high quality and durability standards,
and warrants to the original purchaser that for a period of
ninety days from date of purchase that the engine/motor,
the belts (if so equipped), and the blades (if so equipped)
are free of defects in materials and workmanship. Harbor
Freight Tools also warrants to the original purchaser,
for a period of one year from date of purchase, that all
other parts and components of the product are free
from defects in materials and workmanship (90 days if
used by a professional contractor or if used as rental
equipment). This warranty does not apply to the spark
plug, air filter and recoil starter. This warranty does not
apply to damage due directly or indirectly, to misuse,
abuse, negligence or accidents, repairs or alterations
outside our facilities, 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.
3491 Mission Oaks Blvd. • PO Box 6009
Camarillo, CA 93011
United States Emission Control Defects
Warranty Statement
(for Model 68123)
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 1997 and later Small OffRoad Engine (herein engine). Within the United States, new off-road,
spark-ignition engines certified for model year 1997 and later, must be
designed, built and equipped to meet the stringent anti-smog 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.
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.
Where a warrantable condition exists, HFT will repair your
engine at no cost to you including diagnosis, parts and labor.
California and United States Emission Control Defects
Warranty Statement
(for Model 68122)
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 1995 and later Small Off-Road Engine (herein
engine). In California, the engine must be designed, built and equipped
to meet the State’s stringent anti-smog standards. Elsewhere within
the United States, new off-road, spark-ignition engines certified for
model year 1997 and later, 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.
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.
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 1995 and later 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.
Vertical Engine
For technical questions, please call 1-800-520-0882.
Page 17
• 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 1-800-444-3353.
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 1-800-444-3353.
3. Consequential Damages Coverage
Coverage under this warranty shall also extend to the failure
of any engine components caused by the failure of any
warranted part while it is still covered under this warranty.
f)
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
Improper or inadequate maintenance of any warranted parts
Repairs performed outside of the authorized
warranty service dealers
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)
2)
3)
4. Coverage Exclusions
Page 18
d)
e)
4)
5)
Fuel Metering System
i) Carburetor and its internal parts.
ii) Fuel pump (if so equipped).
iii) Cold start enrichment system.
Air Induction System
i) Intake pipe/manifold.
ii) Air cleaner.
Ignition System
i) Spark plug.
ii) Magneto ignition system.
Catalyst System (if so equipped)
i) Exhaust pipe stud.
ii) Muffler.
iii) Catalytic converter (if so equipped).
Miscellaneous Items Used in Above Systems
i) Vacuum, temperature and time
sensitive valves and switches.
ii) Hoses, belts, connectors, and assemblies.
CALL SERVICE FOR ENGINE ISSUES AT:
(800) 520-0882 M-F 8-5 CST
For technical questions, please call 1-800-520-0882.
Vertical Engine
Mounting Hole Diagram
A-A
2:1
Note: Not to scale.
0.98 in. / 25mm
A
Ø8mm
1.1 in. / 28mm
6*Ø0.35 in. / 9mm
Ø0.24 in. / 6mm
Ø8 in. / 203mm
3.27 in. / 83mm
A
Ø0.34 in. / 8.7mm
A
Ø1 in. / 25.4mm
Ø0.24 in.
/ 6mm
Ø0.34 in.
/ 8.7mm
A
3.94 in. / 100mm
Vertical Engine
3.85 in. / 97.7mm
For technical questions, please call 1-800-520-0882.
Page 19
68122 Parts List and Diagram
Part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
Page 20
Description
Cover, Cylinder Head
Gasket, Cylinder Head Cover
Head Asm., Cylinder
Gasket, Cylinder Head
Bolt
Plug, Spark
Bolt, Cylinder Head
Bracket, Muffler Shield
Bolt
Stud
Pin
Crankcase Asm.
Shield, Crankcase Side
Dipstick Asm., Oil
Bolt
Bolt
Bracket, Fuel Tank Right
Seal, Oil
Bolt
Bolt
Plate, Breath Groove Cover
Gasket, Breath Groove
Piece, Breath
Strainer, Breath Groove
Shield, Crankcase Rear
Bearing
Bracket, Fuel Tank Left
Bolt
Arm, Governor
Washer
Seal, Oil
Pin
Bracket, Fuel Tank Lower
Bolt
Gasket, Crankcase
Pin
Washer
Block, Returning Oil
Bolt
Plate, Governor Spindle Compression
Seal, Oil
Bolt
Gear Asm., Governor
Cover, Crankcase
Ring, The First
Ring, The Second
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
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
1
1
2
1
1
1
1
1
6
1
1
1
1
1
1
2
1
1
1
2
2
2
2
2
1
2
1
Part
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Description
Plate Asm., Lifter Stopper
Lifter, Valve
Tappet, Valve
Camshaft Asm.
Valve, Exhaust
Starter Asm., Recoil
Housing, Engine
Shroud
Nut
Stud
Stud
Gasket, Insulator Plate
Plate, Carburetor Insulator
Gasket, Carburetor
Gasket, Carburetor Insulator
Carburetor Asm.
Gasket, Air Cleaner
Priming Bulb
Gasket, Air Cleaner
Tube, Breather
Nut
Case, Air Cleaner
Element Asm., Air Cleaner
Cover, Air Cleaner Case
Cover, Muffler Outer
Gasket, Exhaust Outlet
Bolt
Bolt
Muffler Asm.
Bolt
Tank Asm., Fuel
Strainer, fuel
Clamp
Tube, Fuel
Clamp
Collar
Hose, Vapor Rubber
Valve, One Way
Jacket, Rubber
Hose, Vapor Rubber
Clamp
Hose, Air Cleaner Rubber
Collector, Vapor
Bracket Asm., Vapor Collector
Nut, Flywheel
Flywheel Asm.
Bolt
Coil, Ignition
Brake Asm.
Bolt
Bolt
Rod, Governor
Spring, Throttle Valve Returning
Control Asm., Throttle
Bolt
Support Asm., Governor
Bolt, Governor Support
Nut
Spring, Governor
Clip
For technical questions, please call 1-800-520-0882.
Qty.
1
2
2
1
1
1
1
1
3
2
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
3
2
1
2
1
1
1
1
1
4
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Vertical Engine
68122 Parts List and Diagram
69
69
69
67
68
70
70
111
10 5
71
66
10 6
110
87
87
89
88
18
96
34
98
97
88
95
99
96
10 0
10 4
93
10 1
10 2
10 1
10 3
94 92
112
26
49
91
90
28
2930 32
31
45
96
34
27
12
46
86
22
23
24 33
25
14
47
87
20
20
21
19
15
17
16
15
13
85
10 9
10 7
10 8
116
113
50
11
4
8
11
49
55
10
6
1
7
5
7
55
10
3
2
5
5
5
54
53
7
72 73
53
74
54
75 76
74
57
57
118
119
115
63
65
62
63
43
62
35
59
36
56
78
37
39
40
36
80
82
38
83
84
79
44
77
41
42
42
Vertical Engine
117
114
58
59 61
56
12 0
51
48
60
9
7
52
64
42
42
For technical questions, please call 1-800-520-0882.
42
81 81
42
Page 21
68123 Parts List and Diagram
Part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Page 22
Description
Cover, Cylinder Head
Gasket, Cylinder Head Cover
Head Asm., Cylinder
Gasket, Cylinder Head
Bolt
Plug, Spark
Bolt, Cylinder Head
Bracket, Muffler Shield
Bolt
Stud
Pin
Crankcase Asm.
Shield, Crankcase Side
Dipstick Asm., Oil
Bolt
Bolt
Bracket, Fuel Tank Right
Seal, Oil
Bolt
Bolt
Plate, Breath Groove Cover
Gasket, Breath Groove
Piece, Breath
Strainer, Breath Groove
Shield, Crankcase Rear
Bearing
Bracket, Fuel Tank Left
Bolt
Arm, Governor
Washer
Seal, Oil
Pin
Gasket, Crankcase
Pin
Washer
Block, Returning Oil
Bolt
Plate, Governor Spindle
Compression
Seal, Oil
Bolt
Gear Asm., Governor
Cover, Crankcase
Ring, The First
Ring, The Second
Ring Set, Oil
Piston
Clip, Piston Pin
Pin, Piston
Rod, Connecting
Crankshaft Asm.
Nut, Valve Lock
Nut, Valve Adjusting
Seat, Valve Spring
Rocker, Valve
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
1
1
1
6
1
1
1
1
1
1
2
1
1
1
2
2
2
2
Part
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
Description
Spring, Valve
Guide, Seal
Bolt, Valve Adjusting
Valve, Intake
Plate Asm., Lifter Stopper
Lifter, Valve
Tappet, Valve
Camshaft Asm.
Valve, Exhaust
Starter Asm., Recoil
Housing, Engine
Shroud
Nut
Stud
Stud
Gasket, Insulator Plate
Plate, Carburetor Insulator
Gasket, Carburetor
Gasket, Carburetor Insulator
Carburetor Asm.
Gasket, Air Cleaner
Priming Bulb
Gasket, Air Cleaner
Tube, Breather
Nut
Case, Air Cleaner
Element Asm., Air Cleaner
Cover, Air Cleaner Case
Cover, Muffler Outer
Muffler Asm.
Gasket, Exhaust Outlet
Bolt
Bolt
Strainer,Fuel
Clamp
Tube, Fuel
Clamp
Bolt
Tank Asm., Fuel
Nut, Flywheel
Flywheel Asm.
Bolt
Coil, Ignition
Brake Asm.
Bolt
Bolt
Rod, Governor
Spring, Throttle Valve Returning
Control Asm., Throttle
Bolt
Support Asm., Governor
Bolt, Governor Support
Nut
Spring, Governor
Clip
For technical questions, please call 1-800-520-0882.
Qty.
2
1
2
1
1
2
2
1
1
1
1
1
3
2
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
1
3
2
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Vertical Engine
68123 Parts List and Diagram
67
67
67
65
66
68
68
94
10 0
69
64
95
99
98
96
97
20
20
21
19
15
16
15
13
86
86
93
18
92
85
43
10 1
26
8
11
53
6
7
10
3
2
5
52
54
70 71
51
72
52
73 74
72
55
10 8
10 4
61
63
60
61
41
60
33
57
34
54
76
37
38
34
35
78
80
36
81
82
77
42
75
39
40
40
Vertical Engine
10 7
10 3
56
57 59
51
7
5
5
53
55
10 6
10 9
49
46
58
47
10
50
62
9
7
7
10 2
48
11
4
5
10 5
47
87
1
91
28
29 30 32
31
12
44
84
88
89 90
45
87
92
27
14
83
86
22
23
24
25
17
40
40
For technical questions, please call 1-800-520-0882.
40
79 79
40
Page 23
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 520-0882
www.harborfreight.com