Predator | 346 | Owner`s manual | Predator 346 Owner`s manual

Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly, operating,
inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the manual
near the assembly diagram (or month and year of purchase if product has no number). Keep this manual and
the receipt in a safe and dry place for future reference.
212, 346 and 420 cc
Horizontal Engines
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.
Manual Revised 11k
Only use OUTSIDE
and far away from
windows, doors,
and vents.
Visit our website at: http://www.harborfreight.com
Email our technical support at: tech@harborfreight.com
ITEMS 68120, 68121,
68136, 68306
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.
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.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Table of Contents
SAFETY
Specifications.............................................. 2
Safety.......................................................... 3
Setup........................................................... 6
Operation..................................................... 8
Maintenance............................................... 14
Troubleshooting.......................................... 18
Warranties.................................................. 20
Parts Lists and Diagrams........................... 22
Specifications
Description
SETUP
Displacement
Engine Type
Cooling System
Fuel
Engine Oil
Type
Capacity
Type SAE
Capacity
Run Time @ 50% Load
with full tank
Sound Level at 22 feet
Bore x Stroke
Compression Ratio
Rotation viewed from PTO
68120, 68121
OPERATION
Shaft
Spark Plug
Valve Clearance
Speed
68306
212cc
346cc
420cc
Horizontal Single Cylinder 4 stroke OHV
Forced air cooled
87+ octane unleaded gasoline
1 Gallon
1 Gallon
1 Gallon
10W-30 above 32° F
5W30 at 32° F or below
0.5 Quart
1.16 Quart
1.16 Quart
3 hr.
104 dB
70 mm x 55 mm
108 dB
83 mm x 64 mm
8.5:1
108 dB
90 mm x 66 mm
Counterclockwise
(power takeoff - the output shaft)
Shaft
68136
3/4″ x 2.41″
1″ x 3.48″
1″ x 3.48″
Keyway
3/16″ (4.76 mm)
1/4″ (6.35 mm)
1/4″ (6.35 mm)
End Tapped
5/16″ - 24 UNF
3/8″ - 24
3/8″ - 24
NGK® BP-6ES
NHSP® / Torch® F6TC
NHSP® / Torch® F6TC
NHSP® / Torch® F6TC
Type
Gap
Intake
Exhaust
Idle
0.7 - 0.8 mm
0.10 - 0.15 mm
0.15 - 0.20 mm
1,800 ± 50 RPM
MAINTENANCE
Page 2
For technical questions, please call 1-800-520-0882.
Horizontal Engines
WARNING SYMBOLS AND DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
SAFETY
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.
RPM
HP
Property or Statement
Revolutions Per Minute
Horsepower
WARNING marking concerning
Risk of Eye Injury. Wear ANSI-approved
safety goggles with side shields.
Read the manual before set-up and/or use.
WARNING marking concerning
Risk of Hearing Loss.
Wear hearing protection.
Symbol
Property or Statement
WARNING marking concerning
Risk of Respiratory Injury.
Operate engine OUTSIDE and far away
from windows, doors, and vents.
WARNING marking concerning
Risk of Fire while handling fuel.
Do not smoke while handling fuel.
WARNING marking concerning
Risk of Fire.
Do not refuel while operating.
Keep flammable objects away from engine.
OPERATION
Symbol
SETUP
Symbol Definitions
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.
MAINTENANCE
SAVE THESE INSTRUCTIONS
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 3
Set up Precautions
SAFETY
1. Gasoline fuel and fumes are flammable, and
potentially explosive. Use proper fuel storage
and handling procedures. Do not store fuel
or other flammable materials nearby.
4. Set up and use only on a flat, level,
well‑ventilated surface.
2. Have multiple ABC class fire extinguishers nearby.
6. Use only lubricants and fuel recommended
in the Specifications chart of this manual.
3. Operation of this equipment may create sparks
that can start fires around dry vegetation. A spark
arrestor may be required. The operator should
contact local fire agencies for laws or regulations
relating to fire prevention requirements.
5. Wear ANSI-approved safety goggles, heavy-duty
work gloves, and dust mask/respirator during set up.
Operating Precautions
CARBON MONOXIDE HAZARD
Using an engine indoors CAN KILL
YOU IN MINUTES.
Engine exhaust contains carbon
monoxide. This is a poison you cannot
see or smell.
1.
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.
SETUP
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.
NEVER use inside a home or garage,
EVEN IF doors and windows are open.
OPERATION
Only use OUTSIDE and far away from windows,
doors, and vents.
2. Keep children away from the equipment,
especially while it is operating.
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.
MAINTENANCE
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.
Page 4
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.
For technical questions, please call 1-800-520-0882.
Horizontal Engines
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.)
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.
SETUP
21. Do not cover the engine or
equipment during operation.
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.
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.
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. TO PREVENT FUEL LEAKAGE AND FIRE
HAZARD, do not fill fuel above the bottom of
fuel strainer for the 68121, 212cc engine.
4. Wear ANSI-approved safety goggles, heavy-duty
work gloves, and dust mask/respirator during service.
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.
68121 Max Fuel
DO NOT OVERFILL!
4. Do not fill fuel tank to the top. Leave a little
room for the fuel to expand as needed.
MAINTENANCE
5. Maintain labels and nameplates on the equipment.
These carry important information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
5. Refuel in a well-ventilated area only.
6. Wipe up any spilled fuel and allow excess
to evaporate before starting engine.
To prevent FIRE, do not start the engine
while the smell of fuel hangs in the air.
SAVE THESE INSTRUCTIONS.
Horizontal Engines
OPERATION
20. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
SAFETY
Operating Precautions (cont.)
For technical questions, please call 1-800-520-0882.
Page 5
Set Up
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual
including all text under subheadings therein before set up or use of this product.
SAFETY
SETUP
TO PREVENT SERIOUS INJURY:
Operate only with proper spark arrestor installed.
Model 68120: 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.
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.
Models 68306, 68121, and 68136: 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.
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.
WARNING! DO NOT INSTALL THIS
ENGINE ON A VEHICLE.
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:
OPERATION
(lower gauge numbers
mean thicker cables)
Cable Gauge
Maximum
Cable Length
6
4
2
5′
7′
12′
Motor Starter Assembly
Starting Relay
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.
MAINTENANCE
3. 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.
REV 11j
Page 6
For technical questions, please call 1-800-520-0882.
Horizontal Engines
Engine Controls
Fuel Cap
SAFETY
Air Filter
Engine
Switch
(Electric
Start Models)
Muffler
SETUP
Starter
Handle
Throttle
Dipstick
Choke
Fuel Valve
Starter
OPERATION
Oil Drain Plug
(Electric
Start Models)
Serial
Number
Location
MAINTENANCE
(Write on front
cover of manual.)
Engine
Switch
(Manual Start
Models)
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 7
Operation
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual
including all text under subheadings therein before set up or use of this product.
SAFETY
Pre-Start Checks
Inspect engine and equipment looking for damaged, loose, and missing parts before set up
and starting. If any problems are found, do not use equipment until fixed properly.
Checking and Filling Engine Oil
SETUP
NOTICE: Your Warranty is VOID if the engine’s
crankcase is not properly filled with oil before
each use. Before each use, check the oil level.
Do not run the engine with low or no engine oil.
Running the engine with no or low engine oil
WILL permanently damage the engine.
Full level
Full level
1. Make sure the engine is stopped and is level.
2. Close the Fuel Valve.
3. Clean the top of the Dipstick and the area around it.
Remove the Dipstick by threading it counterclockwise,
and wipe it off with a clean lint free rag.
4. Reinsert the Dipstick without threading it in and
remove it to check the oil level. The oil level
should be up to the full level as shown above.
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 15 in the Service section shows other
viscosities to use in different average temperatures.)
OPERATION
6. Thread the dipstick back in clockwise.
NOTICE: Do not run the engine with too little oil.
The engine will be permanently damaged.
MAINTENANCE
Page 8
For technical questions, please call 1-800-520-0882.
Horizontal Engines
Checking and Filling Fuel
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 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, 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.
SETUP
Starting the Engine
SAFETY
WARNING! TO PREVENT SERIOUS
INJURY FROM FIRE:
Fill the fuel tank in a well-ventilated area
away from ignition sources. If the engine is
hot from use, shut the engine off and wait
for it to cool before adding fuel.
Do not smoke.
Before Starting the Engine
MAINTENANCE
OPERATION
Before starting the engine:
a. Follow the Set Up Instructions in the equipment manual to prepare the equipment.
b. Inspect the equipment and engine.
c. Fill the engine with the proper amount and type of both fuel and oil.
d. Read the Equipment Operation section in the equipment manual.
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 9
Manual Start
SAFETY
1. To start a cold engine, move the Choke to the
CHOKE position.
To restart a warm engine, leave the Choke in the
RUN position.
1
CHOKERUN
2. Open the Fuel Valve.
SETUP
2
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.
3
OPERATION
O
OFF
ON
MAINTENANCE
4. Turn the Engine Switch on.
4
5. Grip the Starter Handle of the Engine loosely and pull
it slowly several times to allow the gasoline to flow into
the Engine’s carburetor. Then pull the Starter Handle
gently until resistance is felt. Allow Cable to retract fully
and then pull it quickly. Repeat until the engine starts.
5
ON
I
Note: Do not let the Starter Handle snap back against the engine.
Hold it as it recoils so it doesn't hit the engine.
Page 10
For technical questions, please call 1-800-520-0882.
Horizontal Engines
6
SAFETY
6. Allow the Engine to run for several seconds.
Then, if the Choke lever is in the CHOKE position,
move the Choke Lever very slowly to its RUN position.
Note: Moving the Choke Lever too fast could stall the engine.
CHOKERUN
IMPORTANT: Allow the engine to run at no load for five minutes with no
load after each start‑up so that the engine can stabilize.
7. Adjust the Throttle as needed.
8. 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.
SETUP
• 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.
1. To stop the engine in an emergency,
turn the Engine Switch off.
OFF
O
OPERATION
Stopping the Engine
I
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.
MAINTENANCE
c. Close the Fuel Valve.
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 11
Electric Start (if equipped)
SAFETY
1. To start a cold engine, move the Choke to the
CHOKE position.
To restart a warm engine, leave the Choke in the
RUN position.
1
CHOKERUN
SETUP
2
2. Open the Fuel Valve.
3. Slide the Throttle or Speed Control Lever to 1/3
away from the SLOW position (the “turtle”).
OPERATION
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.
3
ON
4. Turn the Engine Switch to START.
MAINTENANCE
Page 12
OFF
START
4
For technical questions, please call 1-800-520-0882.
START
Horizontal Engines
5
SAFETY
5. Allow the Engine to run for several seconds.
Then, if the Choke lever is in the CHOKE position,
move the Choke Lever very slowly to its RUN position.
Note: Moving the Choke Lever too fast could stall the engine.
CHOKERUN
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:
SETUP
• 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.
1. To stop the engine in an emergency,
turn the Engine Switch off.
OPERATION
Stopping the Engine
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.
MAINTENANCE
c. Close the Fuel Valve.
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 13
Maintenance
WARNING
SAFETY
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING:
Turn the Power Switch of the equipment to its “OFF” position, wait for the engine to cool, and disconnect
the spark plug cap before performing any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM EQUIPMENT FAILURE:
Do not use damaged equipment. If abnormal noise, vibration, or excess
smoking occurs, have the problem corrected before further use.
Follow all service instructions in this manual. The engine may fail critically if not serviced properly.
Many maintenance procedures, including any not detailed in this manual, will need to be
performed by a qualified technician for safety. If you have any doubts about your ability to safely
service the equipment or engine, have a qualified technician service the equipment instead.
Cleaning, Maintenance, and Lubrication Schedule
SETUP
Note: This maintenance schedule is intended solely as a general guide. If performance decreases or if
equipment operates unusually, check systems immediately. The maintenance needs of each piece of equipment
will differ depending on factors such as duty cycle, temperature, air quality, fuel quality, and other factors.
Note: The following procedures are in addition to the regular checks and maintenance
explained as part of the regular operation of the engine and equipment.
Before
Each Use
Procedure
Monthly or
Every 3 mo. or Every 6 mo. or
every 20
50 hr. of use 100 hr. of use
hr. of use
Yearly or
every 300
hr. of use
Every
2 Years
Brush off outside of engine
Check engine oil level
Check air cleaner
Check deposit cup
OPERATION
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.
MAINTENANCE
Page 14
For technical questions, please call 1-800-520-0882.
Horizontal Engines
Checking and Filling Fuel
Engine Oil Change
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.
CAUTION! Oil is very hot during operation and can
cause burns. Wait for engine to cool before changing oil.
1. Clean the Fuel Cap and the area around it.
4. Remove the drain plug and, if possible,
tilt the crankcase slightly to help drain
the oil out. Recycle used oil.
5. Replace the drain plug and tighten it.
6. Clean the top of the Dipstick and the area around it.
Remove the Dipstick by threading it counterclockwise,
and wipe it off with a clean lint free rag.
Full level
Full level
68121 Max Fuel
DO NOT OVERFILL!
WARNING! TO PREVENT FUEL LEAKAGE AND
FIRE HAZARD, do not fill fuel above the bottom
of fuel strainer for the 68121, 212cc engine.
Note: Do not use gasoline containing more than
10% ethanol (E10). Do not use E85 ethanol.
7. Add the appropriate type of oil until the oil level is at
the full level. SAE 10W‑30 oil is recommended for
general use.
The SAE Viscosity Grade chart shows other
viscosities to use in different average temperatures.
SAE Viscosity Grades
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.
30
10W-30
4. Then replace the Fuel Cap.
5. Wipe up any spilled fuel and allow excess
to evaporate before starting engine.
To prevent FIRE, do not start the engine
while the smell of fuel hangs in the air.
SAFETY
3. Place a drain pan (not included) underneath
the crankcase’s drain plug.
SETUP
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. For the 68121, fill to
the bottom of the fuel strainer ONLY, see below.
2. Close the Fuel Valve.
5W-30
-20
0
20
40
60
80
Average outdoor temperature
100°F
OPERATION
2. Unscrew and remove the Fuel Cap.
1. Make sure the engine is stopped and is level.
8. Thread the dipstick back in clockwise.
MAINTENANCE
CAUTION! Do not run the engine with too little oil.
The engine will be permanently damaged.
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 15
Air Filter Element Maintenance
1. Remove the air filter cover and the
air filter elements and check for dirt.
Clean or replace as described below.
2. Cleaning:
SAFETY
• For “paper” filter elements:
To prevent injury from dust and debris,
wear ANSI-approved safety goggles,
NIOSH‑approved dust mask/respirator, and
heavy-duty work gloves. In a well-ventilated
area away from bystanders, use pressurized
air to blow dust out of the air filter. 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.
SETUP
3. Install the new filter or the cleaned filter.
Secure the Air Cleaner Cover before use.
Spark Plug Maintenance
Spark
Plug
Cap
1. Disconnect spark plug cap from end of plug.
Clean out debris from around spark plug.
2. Using a spark plug wrench, remove the spark plug.
3. Inspect the spark plug:
If the electrode is oily, clean it using a clean, dry
rag. If the electrode has deposits on it, polish it
using emery paper. If the white insulator is cracked
or chipped, the spark plug needs to be replaced.
Recommended Spark Plugs
Brand
NGK®
NHSP® / TORCH®
68120, 68121
BP-6ES
F6TC
68136
68306
F6TC
F6TC
NOTICE: Using an incorrect spark
plug may damage the engine.
4. When installing a new spark plug, adjust the
plug’s gap to the specification on the Technical
Specifications chart. Do not pry against the
electrode, the spark plug can be damaged.
OPERATION
5. Install the new spark plug or the cleaned spark plug
into the engine. Gasket-style: Finger-tighten until the
gasket contacts the cylinder head, then tighten about
1/2-2/3 turn more.
Non-gasket-style: Finger-tighten until the plug
contacts the 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.
MAINTENANCE
Page 16
For technical questions, please call 1-800-520-0882.
Horizontal Engines
Storage
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.
Sediment Cup
(some engines)
Drain Plug
b. Remove the drain bolt from the bottom of the
carburetor bowl and allow the fuel to drain.
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. BATTERY:
Disconnect battery cables (if equipped).
Recharge batteries monthly while in storage.
5. 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.
6. 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.
MAINTENANCE
c. Remove the small sediment cup next to the bowl
and allow the fuel to drain from there as well.
a. Change engine oil.
SAFETY
2. FUEL:
3. LUBRICATION:
SETUP
1. CLEANING:
Wait for engine to cool, then clean engine with
dry cloth. NOTICE: Do not clean using water.
The water will gradually enter the engine
and cause rust damage. Apply a thin coat
of rust preventive oil to all metal parts.
d. Open the fuel valve. After all fuel has
drained, reinstall the drain bolt and sediment
cup (if equipped). Tighten securely.
OPERATION
When the equipment is to remain idle for longer than
20 days, prepare the engine for storage as follows:
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 17
Troubleshooting
Possible Causes
Engine will not start
FUEL RELATED:
1. No fuel in tank or fuel valve closed.
2. Choke not in CHOKE position, cold engine.
3. Gasoline with more than 10% ethanol
used. (E15, E20, E85, etc.)
SAFETY
Problem
Probable Solutions
9. Clogged Fuel Filter.
FUEL RELATED:
1. Fill fuel tank and open fuel valve.
2. Move Choke to CHOKE position.
3. Clean out ethanol rich gasoline from fuel
system. Replace components damaged
by ethanol. Use fresh 87+ octane
unleaded gasoline only.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
4. Use fresh 87+ octane 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 CHOKE position.
9. Replace Fuel Filter.
IGNITION (SPARK) RELATED:
1. Spark plug cap not connected securely.
2. Spark plug electrode wet or dirty.
3. Incorrect spark plug gap.
4. Spark plug cap broken.
5. Circuit breaker tripped
(electric start models only).
6. 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. Reset circuit breaker. Check wiring and
starter motor if breaker continues to trip.
6. Have qualified technician diagnose/
repair ignition system.
4. Low quality or deteriorated, old gasoline.
5. Carburetor not primed.
6. Dirty fuel passageways.
SETUP
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.
OPERATION
MAINTENANCE
COMPRESSION RELATED:
COMPRESSION RELATED:
1. Cylinder not lubricated. Problem after long 1. Pour tablespoon of oil into spark
storage periods.
plug hole. Crank engine a few
times and try to start again.
2. Loose or broken spark plug. (Hissing
2. Tighten spark plug. If that does not work,
noise 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.
Page 18
For technical questions, please call 1-800-520-0882.
Horizontal Engines
5. Incorrect compression.
Engine stops
suddenly
1. Low oil shutdown.
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.
1. Check wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug cap.
4. Use only fresh 87+ octane
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.)
1. Fill engine oil to proper level. Check
engine oil before EVERY use.
2. Fill fuel tank with fresh 87+ octane
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
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 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.
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.
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.
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.
SAFETY
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.
Probable Solutions
SETUP
Engine misfires
Possible Causes
OPERATION
Problem
MAINTENANCE
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 19
Warranties
Limited 90 Day Warranty
SAFETY
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and
warrants to the original purchaser that this product is free from defects in materials and workmanship for the period
of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly, to misuse,
abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries to persons or
property, or for incidental, contingent, special or consequential damages arising from the use of our product. Some
states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation of
exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
SETUP
To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid.
Proof of purchase date and an explanation of the complaint must accompany the merchandise. If our inspection
verifies the defect, we will either repair or replace the product at our election or we may elect to refund the purchase
price if we cannot readily and quickly provide you with a replacement. We will return repaired products at our expense,
but if we determine there is no defect, or that the defect resulted from causes not within the scope of our warranty,
then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
Emission Control System Warranty
OPERATION
United States Emission Control Defects
Warranty Statement
(for Model 68120)
California and United States Emission Control
Defects Warranty Statement
(for Models 68306, 68121, and 68136)
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.
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.
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.
MAINTENANCE
Page 20
For technical questions, please call 1-800-520-0882.
Horizontal Engines
If you have any questions regarding your warranty rights and
responsibilities, you should contact the Harbor Freight Tools Customer
Service Department at 1-800-520-0882.
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 1-800-520-0882.
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. 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.
3)
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.
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.
Horizontal Engines
SAFETY
Owner’s Warranty Responsibilities
• As the engine owner, you are responsible for the performance
of the required maintenance listed in your Owner’s Manual. HFT
recommends that you retain all receipts covering maintenance
on your engine, but HFT cannot deny warranty solely for the lack
of receipts or for your failure to ensure the performance of all
scheduled maintenance.
• As the engine owner, you should, however, be aware that HFT
may deny you warranty coverage if your engine or a part has failed
due to abuse, neglect, improper maintenance, or unapproved
modifications.
• You are responsible for shipping your engine to a HFT warranty
station as soon as a problem exists. Contact the HFT Customer
Service department at the number below to make shipping
arrangements. The warranty repairs should be completed in a
reasonable amount of time, not to exceed 30 days.
SETUP
Warranty claims shall be filed in accordance with the provisions
of the HFT warranty policy explained in the box at the top of the
previous page. HFT shall not be liable for any loss of use of the
engine, for any alternative usage, for any damage to goods, loss of
time, or inconvenience. Warranty coverage shall also be excluded
for any part which fails, malfunctions, or is damaged due to failure
to follow the maintenance and operating instructions set forth in the
Owner’s Manual including, but not limited to:
a) Use of parts which are not authorized by HFT
b) Improper installation, adjustment or repair of the engine or of
any warranted part unless performed by an authorized warranty
center
c) Failure to follow recommendations on fuel use contained in the
Owner’s Manual
d) Improper or inadequate maintenance of any warranted parts
e) Repairs performed outside of the authorized warranty
service dealers
f) Alterations by changing, adding to or removing parts from
the engine.
For technical questions, please call 1-800-520-0882.
Page 21
OPERATION
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.
4. Coverage Exclusions
MAINTENANCE
Harbor Freight Tools Emission Control Defects
Warranty Coverage
Parts Lists and Diagrams
68120 212cc Parts List
SAFETY
Part
SETUP
OPERATION
MAINTENANCE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Description
Gasket, Cylinder Head
Cover Asm., Cylinder Head
Gasket, Cylinder Head Cover
Tube, Breather
Bolt
Stud
Stud
Stud
Pin
Bolt, Cylinder Head
Plug, Spark
Head Asm., Cylinder
Crankcase Asm.
Sensor, Engine Oil
Gear Asm., Governor
Arm, Governor
Bolt, Drain Plug
Washer
Bearing
Seal, Oil
Washer
Pin
Bolt
Cover, Crankcase
Bearing
Seal, Oil
Gasket, Crankcase
Pin
Dipstick Asm., Oil
Plug Asm., Engine Oil
Bolt
Crankshaft Asm.
Clip, Piston Pin
Piston
Pin, Piston
Rod, Connecting
Ring, The First
Ring, The Second
Ring Set, Oil
Camshaft Asm.
Valve, Exhaust
Valve, Intake
Seat, Valve Spring
Retainer_ Exhaust Valve
Rotator, Valve
Guide, Seal
Tappet, Valve
Lifter, Valve
Plate Asm., Lifter Stopper
Bolt, Valve Adjusting
Record Product’s Serial Number Here:
Note: If product has no serial number,
record month and year of purchase instead.
Page 22
Qty.
1
1
1
1
4
1
1
2
2
4
1
1
1
1
1
1
2
2
1
1
1
1
2
1
1
1
1
2
1
1
6
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
Part
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
Description
Rocker, Valve
Nut_ Valve Adjusting
Nut, Valve Lock
Spring, Valve
Starter Asm., Recoil
Bolt
Shroud
Shroud, Cylinder Body
Shield,Lower
Protector, Oil
Switch Asm., Stop Engine
Bolt
Bolt
Collar
Bolt
Bolt
Carburetor Asm.
Gasket, Air Cleaner
Gasket, Carburetor
Plate, Carburetor Insulator
Gasket, Carburetor Insulator
Nut
Cleaner, Air
Bolt
Gasket, Exhaust Outlet
Nut
Muffler Asm.
Tank, Fuel
Strainer, Fuel
Cover, Fuel Tank
Outlet Asm., Fuel Tank Oil
Collar
Tube, Fuel
Bolt
Nut
Nut, Flywheel
Pulley,Starter
Impeller
Flywheel Asm.
Bolt
Coil, Ignition
Control Asm., Throttle
Bolt
Spring, Governor
Rod, Governor
Spring, Throttle Valve Returning
Bolt, Governor Support
Nut
Support Asm., Governor
Qty.
2
2
2
2
1
3
1
1
1
1
1
2
1
1
1
4
1
1
1
1
1
2
1
1
1
2
1
1
1
1
1
2
1
1
2
1
1
1
1
2
1
1
2
1
1
1
1
1
1
Note: Some parts are listed and shown for
illustration purposes only, and are not available
individually as replacement parts.
For technical questions, please call 1-800-520-0882.
Horizontal Engines
Horizontal Engines
5
5
5
5
For technical questions, please call 1-800-520-0882.
3
76
4
10
10
10
10
11
12
8
75
8
71
MAINTENANCE
2
76
70
6
77
69
7
1
67
9
9
31
31
33
31
30
37 38 39
31
31
31
24
34
26
33
51
51
36
27
47
47
68
49
43 5446
44 54 41
48
48
50
50
45
28
28
42
40
23
14
93
74
23
32
93
OPERATION
53 52
53 52
35
25
29
15
92
95
19
96
17
94
97
98
72
72
73
18
16
22
99
21
91
20
83
82
81
90
90
82
85
89
18
17
85
SETUP
13
84
78
62
88
62
87
86
79
59
58
80
64
55
66
65
57
63
66
66
61
56
SAFETY
60
56
56
66
68120 212cc Assembly Diagram
Page 23
68121 212cc Parts List
Part
SAFETY
SETUP
OPERATION
MAINTENANCE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Description
Gasket, Cylinder Head
Cover Asm., Cylinder Head
Gasket, Cylinder Head Cover
Tube, Breather
Bolt
Stud
Stud
Stud
Pin
Bolt, Cylinder Head
Plug, Spark
Head Asm., Cylinder
Crankcase Asm.
Sensor, Engine Oil
Gear Asm., Governor
Arm, Governor
Bolt, Drain Plug
Washer
Bearing
Seal, Oil
Washer
Pin
Bolt
Cover, Crankcase
Bearing
Seal, Oil
Gasket, Crankcase
Pin
Dipstick Asm., Oil
Plug Asm., Engine Oil
Bolt
Crankshaft Asm.
Clip, Piston Pin
Piston
Pin, Piston
Rod, Connecting
Ring, The First
Ring, The Second
Ring Set, Oil
Camshaft Asm.
Valve, Exhaust
Valve, Intake
Seat, Valve Spring
Retainer_ Exhaust Valve
Rotator, Valve
Guide, Seal
Tappet, Valve
Lifter, Valve
Plate Asm., Lifter Stopper
Bolt, Valve Adjusting
Rocker, Valve
Nut_ Valve Adjusting
Nut, Valve Lock
Spring, Valve
Page 24
Qty.
1
1
1
1
4
1
1
2
2
4
1
1
1
1
1
1
2
2
1
1
1
1
2
1
1
1
1
2
1
1
6
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
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
Description
Starter Asm., Recoil
Bolt
Shroud
Shroud, Cylinder Body
Shield,Lower
Protector, Oil
Switch Asm., Stop Engine
Bolt
Bolt
Collar
Bolt
Bolt
Carburetor Asm.
Gasket, Air Cleaner
Gasket, Carburetor
Plate, Carburetor Insulator
Gasket, Carburetor Insulator
Nut
Cleaner, Air
Bolt
Gasket, Exhaust Outlet
Nut
Muffler Asm.
Bolt
Gasket, Auxiliary Air Valve Flange
Valve, Muffler Auxiliary
Tank, Fuel
Strainer, Fuel
Cap, Fuel
Outlet Asm., Fuel Tank Oil
Clamp
Tube, Fuel
Bolt
Nut
Vent, Vapor
Hose, Vapor Rubber
Band
Collector, Vapor
Clamp
Hose, Air Cleaner Rubber
Nut, Flywheel
Pulley,Starter
Impeller
Flywheel Asm.
Bolt
Coil, Ignition
Control Asm., Throttle
Bolt
Spring, Governor
Rod, Governor
Spring, Throttle Valve Returning
Bolt, Governor Support
Nut
Support Asm., Governor
For technical questions, please call 1-800-520-0882.
Qty.
1
3
1
1
1
1
1
2
1
1
1
4
1
1
1
1
1
2
1
1
1
2
1
2
1
1
1
1
1
1
4
1
1
2
1
1
2
1
2
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
Horizontal Engines
Horizontal Engines
5
5
5
5
For technical questions, please call 1-800-520-0882.
3
76
4
10
10
10
10
78
79
11
80
78
12
8
8
75
MAINTENANCE
2
76
71
70
6
69
31
7
1
67
9
9
31
31
33
31
30
37 38 39
77
31
31
24
34
26
33
Page 25
51
51
36
27
47
47
68
49
43 5446
44 54 41
48
48
50
50
45
28
28
42
40
23
74
23
32
14
102
102
OPERATION
53 52
53 52
35
25
29
15
72
17
19
72
18
16
21
92
91
10 8
22
73
107
105
106
103
104
101
100
20
93
89
93
99
99
94
85
84
98
18
85
SETUP
13
85
90
91
87
17
86
85
62
88
62
97
58
96
88
81
95
64
55
59
65
82
66
61
56
66
66
56
56
SAFETY
57
63
60
66
83
68121 212cc Assembly Diagram
68136 346cc Parts List
Part
SAFETY
SETUP
OPERATION
MAINTENANCE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
Description
Gasket, Cylinder Head
Cover Asm., Cylinder Head
Gasket, Cylinder Head Cover
Tube, Breather
Bolt Asm., Cylinder Head Cover
Stud
Stud
Pin
Bolt, Cylinder Head
Plug, Spark
Head Asm., Cylinder
Crankcase Asm.
Seal, Oil
Sensor, Engine Oil
Frame, Fuel Tank Installation
Plug, Rubber
Protector, Oil
Bolt
Washer_ Flat
Bolt, Drain Plug
Clip
Arm, Governor
Seal, Oil
Pin
Bolt
Bolt
Washer_ Flat
Bearing
Cover, Crankcase
Gasket, Crankcase
Plug Asm., Engine Oil
Dipstick Asm., Oil
Pin
Bolt
Bearing
Gear Asm., Governor
Seal, Oil
Bearing
Crankshaft Asm.
Shaft Asm., Balancing
Ring Set, Oil
Clip, Piston Pin
Piston
Pin, Piston
Rod, Connecting
Ring, The First
Ring, The Second
Camshaft Asm.
Valve, Exhaust
Valve, Intake
Seat, Valve Spring
Retainer, Exhaust Valve
Rotator, Valve
Guide, Seal
Tappet, Valve
Lifter Asm., Valve
Page 26
Qty.
1
1
1
1
1
2
2
2
4
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
4
2
1
1
1
1
1
1
2
7
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
Part
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
110
111
112
Description
Plate Asm., Lifter Stopper
Bolt, Valve Adjusting
Rocker, Valve
Nut, Valve Adjusting
Nut, Valve Lock
Spring, Valve
Retainer, Valve Spring
Starter Asm., Recoil
Bolt
Shroud
Shroud, Cylinder Body
Bolt
Bolt
Carburetor Asm.
Gasket, Air Cleaner
Gasket, Carburetor
Plate, Carburetor Insulator
Gasket, Inlet
Nut
Cleaner, Air
Bolt
Nut
Gasket, Exhaust Outlet
Nut
Muffler Asm.
Gasket, Aux. Air Valve Flange
Valve, Muffler Aux. Air
Bolt
Tank, Fuel
Strainer, Fuel
Cover, Fuel Tank
Outlet Asm., Fuel Tank Oil
Collar
Tube, Fuel
Clamp
Nut
Valve, One Way
Hose, Fuel Vapor Rubber
Hose, Air Cleaner Rubber
Collector, Fuel Vapor
Bolt
Cover, Fuel Vapor Collector
Nut, Flywheel
Pulley,Starter
Impeller
Flywheel Asm.
Bolt
Coil, Ignition
Control Asm., Throttle
Bolt
Spring, Throttle Valve Returning
Rod, Governor
Support Asm., Governor
Nut
Bolt, Governor Support
Spring, Governor
For technical questions, please call 1-800-520-0882.
Qty.
1
2
2
2
2
2
1
1
3
1
1
1
5
1
1
1
1
1
2
1
1
3
1
2
1
1
1
2
1
1
1
1
5
1
1
2
1
1
1
1
2
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
Horizontal Engines
Horizontal Engines
5
For technical questions, please call 1-800-520-0882.
2
78
78 78
3
79
81
4
31
61
61
60
59
51
60
53
52
37
59
62
29
63
58
62 58
MAINTENANCE
84 84
82
83
80
80
34
34
34
34
34 34
34
54
73
57
10
72
9
9
9
43
9
70
74
42
36
46 47 41
38
35
32
7
45
30
11
7
44
33
42
6
48
6
1
26
14
8
26
39
8
40
49
25
56
56
50
25
55
92
20
25
89
92
77
91
89
25
55
15
OPERATION
71
33
90
88
19
93
94
85
89
86
87
89
75
28
95
89
97
75
76
12
96
98
23
22
10 4
19
106
13
27
24
105
106
97
18
17
10 2
SETUP
10 3
10 3
20
16
21
112
110
10 1
10 9
111
68
10 0
10 7
108
67
99
66
64
69
69
69
65
SAFETY
69
69
65
65
65
68136 346cc Assembly Diagram
Page 27
68306 420cc Parts List
Part
SAFETY
SETUP
OPERATION
MAINTENANCE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
Page 28
Description
Gasket, Cylinder Head
Cover Asm., Cylinder Head
Gasket, Cylinder Head Cover
Tube, Breather
Bolt Asm., Cylinder Head Cover
Stud
Stud
Pin
Bolt, Cylinder Head
Plug, Spark
Head Asm., Cylinder
Crankcase Asm.
Seal, Oil
Sensor, Engine Oil
Frame, Fuel Tank
Plug, Rubber
Protector, Oil
Bolt
Washer_ Flat
Bolt, Drain Plug
Clip
Arm, Governor
Seal, Oil
Pin
Bolt
Bolt
Washer_ Flat
Bearing
Cover, Crankcase
Gasket, Crankcase
Plug Asm., Engine Oil
Dipstick Asm., Oil
Pin
Bolt
Bearing
Gear Asm., Governor
Seal, Oil
Bearing
Crankshaft Asm.
Shaft Asm., Balancing
Ring Set, Oil
Clip, Piston Pin
Piston
Pin, Piston
Rod, Connecting
Ring, The First
Ring, The Second
Camshaft Asm.
Valve, Exhaust
Valve, Intake
Seat, Valve Spring
Retainer, Exhaust Valve
Rotator, Valve
Guide, Seal
Tappet, Valve
Lifter Asm., Valve
Plate Asm., Lifter Stopper
Bolt, Valve Adjusting
Rocker, Valve
Nut, Valve Adjusting
Nut, Valve Lock
Qty.
1
1
1
1
1
2
2
2
4
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
4
2
1
1
1
1
1
1
2
7
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
2
2
2
Part
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
121
122
Description
Spring, Valve
Retainer, Valve Spring
Starter Asm., Recoil
Bolt
Shroud
Shroud, Cylinder Body
Bolt
Bolt
Carburetor Asm.
Gasket, Air Cleaner
Gasket, Carburetor
Plate, Carburetor Insulator
Gasket, Inlet
Nut
Cleaner, Air
Bolt
Nut
Gasket, Exhaust Outlet
Nut
Muffler Asm.
Gasket, Aux. Air Intake Valve
Valve, Aux. Air Intake
Bolt
Tank, Fuel
Strainer, fuel
Cover, Fuel Tank
Outlet Asm., Fuel Tank Oil
Collar
Tube, Fuel
Clip
Nut
Valve, One Way
Hose, Fuel Vapor Rubber
Hose, Air Cleaner Rubber
Collector, Fuel Vapor
Bolt
Cover, Fuel Vapor Collector
Nut, Flywheel
Pulley, Starter
Impeller
Flywheel Asm.
Bolt
Cap, Spark Plug
Coil Asm., Charge
Bolt
Coil, Ignition
Bolt
Control Asm., Throttle
Bolt
Spring, Throttle Returning
Rod, Governor
Support Asm., Governor
Nut
Bolt, Governor Support
Spring, Governor
Motor Asm.,Starting
Bolt
Relay, Starting
Bolt
Switch,Control
Bolt
For technical questions, please call 1-800-520-0882.
Qty.
2
1
1
4
1
1
1
5
1
2
1
1
1
2
1
1
3
1
2
1
1
1
2
1
1
1
1
5
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
2
1
2
1
2
1
1
1
1
1
1
1
2
1
2
1
2
Horizontal Engines
Horizontal Engines
5
For technical questions, please call 1-800-520-0882.
78
2
78
3
79
81
4
31
61
51
61 60
59
60
53
52
29
59
62
37
63
58
62 58
MAINTENANCE
84 84
82
83
80
80
34
34
34 34
34 34
34
38
54
73
57
10
46
35
72
9
41
47
9
42
36
43
70
74
9
9
32
7
45
30
11
7
44
33
42
6
48
6
1
26
8
14
26
39
8
49
40
56
56
50
25
OPERATION
71
33
55
77
55
92
19
25
91
89
89
25
20
15
25
90
88
93
28
92 89
94
85
86
12
95
89
75
87
75
109
97
20
10 7
16
21
110
110
19
98
96
13
22
24
27
23
76
89
97
18
SETUP
10 8
10 8
17
116
114
10 2
10 1
113
115
68
67
10 0
111
112
99
66
64
118
69
12 2
12 2
12 1
69
119
65
65
65
SAFETY
69
69
12 0
69
117
118
65
68306 420cc Assembly Diagram
Page 29
Mounting Hole Diagrams
Note: Not to scale.
SAFETY
ITEM 68120 / 68121 212cc
6.38 in. / 162mm
2.6 in. / 66mm
3.17 in. / 80.5mm
2.97 in. / 75.5mm
1.6 in. / 40.5mm
SETUP
ITEM 68136 346cc and ITEM 68306 420cc
7.72 in. / 196mm
4.13 in. / 105mm
3.39 in. / 86mm
4.06 in. / 103mm
OPERATION
MAINTENANCE
Page 30
For technical questions, please call 1-800-520-0882.
Horizontal Engines
Power Take-Off Diagrams
Note: Not to scale.
SAFETY
ITEM 68120 / 68121 212cc
2.43 in. / 61.7mm
5/16-24UNF
0.67 in.
/ 17mm
Ø0.75 in. / 19.05mm
0.64 in.
/ 16.36mm
0.1875 in. / 4.78mm
5/16-24UNF
1.79 in. / 45.5mm
Ø3.625 in. / 92mm
4.17 in. / 106mm
SETUP
4x5/16-24UNF
ITEM 68136 346cc and ITEM 68306 420cc
(30°)
(30°)
3.48 in. / 88.5mm
Ø5.75 in.
/ 146mm
Ø5 in. /
127mm
Ø1 in. / 25.4mm
Ø1.17 in. / 29.7mm
0.36 in. / 9.13mm
3/8-24UNF
0.25 in. / 6.35mm
1.1 in. / 28mm
2.2 in. / 56mm
2.84 in. / 72.2mm
OPERATION
Ø3.625 in. / 92mm
Ø6.5 in. / 165.1mm
5.25 in. / 133.5mm
(45°)
MAINTENANCE
(45°)
Horizontal Engines
For technical questions, please call 1-800-520-0882.
Page 31
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 520-0882
www.harborfreight.com
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