Power Fist 8236275 User manual

User Manual
8236275V 2.9
Please read and understand all instructions before use.
Retain this manual for future reference.
140cc OHV Vertical
Gas Engine

140cc OHV
Vertical Gas Engine
2
8236275V 2.9
Visit www.princessauto.com for more information
SPECIFICATIONS
Engine Displacement 140cc
Start Type Pull
Torque 5.31 ft-lb
Shaft Diameter 7/8 in.
Shaft Rotation CCW
Shaft Length 5-1/4 in.
Shaft End Tapped (Diameter (in.) / Threads per in.) 3/8-24 UNF
Number of Cylinders 1
Cylinder Bore 2.55 in. (65mm)
Stroke 1.65 in. (42mm)
Compression Ratio 8.5:1
Air Cleaner Type Foam
Fuel Type Gasoline
Fuel Tank Capacity 0.95 quarts
Fuel Filter Yes
Oil Capacity 0.53 quarts
Lubrication System Splash
Ignition System Transistorized Magneto
Governor System Mechanical
Max. Speed 3,600 RPM
Muffler Included Yes
Spark Plug
Use 4780112
0.028-0.031 in. (0.7 - 0.8mm)

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8236275 V 2.9
SAFETY
IMPORTANT SAFETY PRECAUTIONS
WARNING! Read and understand all instructions before using this engine. The operator must follow
basic precautions to reduce the risk of personal injury and/or damage to the equipment. Before
allowing someone else to use this engine, make sure they are aware of all safety information.
NOTE: Keep this manual for safety warnings, precautions, operating, inspection
and maintenance instructions.
WORK AREA
1. Operate in a safe work environment. Keep your work area clean and well lit.
2. Do not use in the presence of flammable gases or liquids.
a. Do not use pressurized starting fluids with the engine, because the vapors are flammable.
3. Keep anyone not wearing the appropriate safety equipment away from the work area.
PERSONAL SAFETY
CAUTION! Wear protective equipment approved by the Canadian Standards Association (CSA) or
American National Standards Institute (ANSI) when using the tool.
1. Head Protection
a. Always wear impact safety goggles that provide front and side protection for the eyes.
b. Wear earplugs or hearing protector earmuffs if the engine or work environment is noisy.
2. Gloves
a. The gloves should provide protection based on the thermal (heat) levels generate
by the engine.
3. Protective Clothing
a. Wear protective clothing designed for the work environment and engine.
4. Foot Protection
a. Steel toe footwear or steel toe caps to prevent injury from falling objects.
b. Non-skid footwear is recommended to maintain footing and balance.
5. Control the engine, personal movement and the work environment to avoid personal injury or
damage to engine.
a. Keep articles of clothing, jewelry, hair, etc., away from moving parts to avoid entanglement
with the engine. Traumatic amputation or severe laceration can result.
b. Do not operate any tool or machinery when tired or under the influence of drugs, alcohol
or medications.
c. Do not overreach when operating the engine. Proper footing and balance enables better
control of equipment in unexpected situations.

140cc OHV Vertical Gas Engine
4
For technical questions call: 1-800-665-8685
8236275V 2.9
SPECIFIC SAFETY PRECAUTIONS
1. All users must understand the operation of all controls and learn how to stop the engine
quickly in case of emergency.
2. The engine and exhaust become very hot during operation.
Severe thermal burns can occur on contact, especially with the muffler.
a. Keep the engine at least 3 feet (1 meter) away from buildings and other equipment
during operation.
b. Remove accumulated debris from muffler and cylinder area. Combustible debris, such as
leaves, grass, brush, etc. can catch fire if they come in contact with a hot engine.
c. Do not place anything on the engine while it is running.
d. Allow muffler, engine cylinder and fins to cool before touching.
e. Install a spark arrester (not included) before using equipment on forest-covered, grass-
covered or brush-covered unimproved land.
CARBON MONOXIDE POISONING
WARNING! Never start or run this engine indoors as exhaust contains carbon monoxide gas. Opening
windows and doors is not enough to ventilate the area.
Carbon monoxide is a colourless and odourless gas that is difficult to detect. Carbon monoxide poisoning
results from inhalation of the gas and may be lethal if left untreated. Evacuate all people to an area with
clean air and seek immediate medical attention for any person experiencing the following symptoms:
1. Headache
2. Confusion
3. Shortness of breathe
4. Weakness
5. Fatigue
6. Dizziness
7. Unstable gait (stumbling around)
8. Nausea & vomiting
9. Unconsciousness
10. Flu-like symptoms
NOTE: Install a carbon monoxide detector in the work area that has gasoline powered
equipment as a precaution.
USE AND CARE OF ENGINE
1. This engine was designed for a specific function. Do not modify or alter this engine or use it for
an unintended purpose.
a. Do not tamper with governor spring, links or other parts to increase engine speed.
2. Maintain engine with care (see Maintenance).
3. Remove adjusting keys and wrenches from the engine before operation. A wrench or key that is
left attached to a rotating part of the tool increases the risk of personal injury.

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8236275 V 2.9
UNPACKING
1. Carefully remove the parts and accessories from the packaging. Retain packaging material until
you have carefully inspected and satisfactorily installed or operated the engine.
2. Inspect the engine carefully to make sure the tools and accessories were not damaged
while shipping.
WARNING! Do not operate the engine if any part is missing. Replace the missing part before
operating. Failure to do so could result in a malfunction and serious personal injury.
ASSEMBLY
The engine comes pre-assembled.
OPERATION
CAUTION: The manufacturer of the equipment on which this engine is installed specifies the top speed
at which the engine will be operated. Do not exceed this speed.
PRE-OPERATION CHECKS
CAUTION! The engine is not shipped with oil. Before starting the engine, add oil according to the
instructions in this manual. Starting the engine without oil will damage the engine beyond repair.
Check the engine’s condition before operating to maximize the user’s safety and the service life of the
engine. Ensure that the engine is level and the switch is in the OFF position before beginning the
pre-operation checks.
GENERAL CONDITION
1. Look around and underneath the engine for signs of oil or gasoline leaks.
2. Remove any excessive dirt or debris, especially around the muffler and recoil starter.
3. Look for signs of damage.
4. Check that all shields and covers are in place.
5. Check that all nuts, bolts, and screws are tight.
CHECK THE ENGINE
1. Check the fuel level. This will save time for refuelling later.
2. Check the engine oil level. Running the engine with a low oil level can cause engine damage
(see Adding Oil).
3. Check the air filter element. A dirty air filter will reduce engine performance.
4. Check the equipment powered by this engine.
5. Review the instructions provided with the equipment powered by this engine for precautions
and procedures that should be followed before starting the engine.

140cc OHV Vertical Gas Engine
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For technical questions call: 1-800-665-8685
8236275V 2.9
BEFORE STARTING THE ENGINE
Before starting the engine take these precautions:
1. Make sure spark plug, muffler, fuel cap and air cleaner are in place and secured. Do not crank
engine with spark plug removed.
2. Do not start the engine until any spilled fuel evaporates.
STARTING THE ENGINE
WARNING! Do not start or run engine in enclosed area, even if doors or windows are open. Engine
exhaust contains carbon monoxide, an odorless and colorless poison gas.
WARNING! Failure to follow the steps below will result in rapid retraction of the starter cord faster
than the user can let go. This will pull the user’s hand and arm toward the engine, possibly resulting
in serious injury.
CAUTION! Direct-coupled equipment components such as, but not limited to, blades, impellers,
pulleys, sprockets, etc., must be securely attached before the engine is started to avoid injury
or damage.
1. Pull the choke rod out when the engine is cold. This will close the choke and restrict the fuel.
a. As the engine warms, release the choke rod to open the choke.
2. If the equipment that you are connecting the engine to has a flywheel brake, move the flywheel
brake lever (located on equipment) to release the flywheel brake.
3. Pull the starter grip lightly until resistance is felt, then pull briskly.
NOTICE: Do not allow the starter grip to snap back against the engine. Return it gently to
prevent damage to the starter.
4. If your equipment has a flywheel brake, continue to hold the flywheel brake lever (located on
equipment). The engine will stop if you release the flywheel brake lever.
Occasionally you may hear a light ‘spark knock’ or ‘pinging’ (metallic rapping noise) while operating under
heavy loads. This is no cause for concern.
Should the spark knock or pinging continue to occur when the engine speed is steady under a normal
load, consider replacing the fuel. If the sounds continue after changing the fuel, contact Princess Auto
Ltd. for a solution or see a qualified technician.
NOTE: Running the engine with persistent spark knock or pinging can cause engine damage.

140cc OHV Vertical Gas Engine
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8236275 V 2.9
STOPPING THE ENGINE
CAUTION! Do not choke carburetor to stop engine.
If your equipment has a flywheel brake, release the flywheel brake (located on equipment) to stop
the engine.
FUEL RECOMMENDATIONS
This engine is certified to operate on unleaded gasoline with a minimum of 87 octane/87 AKI (91 RON).
Gasoline with up to 10% ethanol (gasohol) or up to 15% MTBE (methyl tertiary butyl ether) is acceptable.
The emissions control system for this engine is EM (Engine Modifications).
CAUTION: Do not use unapproved Gasoline, such as E85. Do not mix oil in gasoline or modify the
engine to run on alternate fuels. This will damage the engine components and void the engine
warranty. To protect the fuel system from gum formation, mix a fuel stabilizer into the fuel.
NOTE: If the engine is routinely operated at altitudes over 5,000 ft (1524 meters), it will be necessary to
have a qualified technician modify the engine for increased performance. Fuel should be a minimum of
85 octane/85 AKI (89 RON) to prevent decreased performance.
HOW TO ADD FUEL
WARNING! Do not refuel the engine inside a building. Gasoline and its vapors are extremely
flammable and explosive. Keep gasoline away from appliance pilot lights, barbecues, electric
appliances, power tools, etc.
Do not use stale or contaminated gasoline or oil/gasoline mixture. Avoid getting dirt or water
in the fuel tank.

140cc OHV Vertical Gas Engine
8
For technical questions call: 1-800-665-8685
8236275V 2.9
1. Clean the fuel cap area of dirt and
debris. Remove the fuel cap.
2. Refuel outdoors or in a
well-ventilated area.
3. Stop the engine and place it on a
level surface.
4. Let engine cool at least 2 minutes
before removing the fuel cap.
5. Check the fuel level.
6. Add fuel until it reaches the bottom
of the fuel level limit marked in the
fuel tank.
a. Fill the tank to approximately 1.5
in. (38 mm) below the top of the
fuel tank to allow for
fuel expansion.
b. Fuel tank capacity is 0.9 litres
7. Take care to not overfill the tank.
NOTE: It may be necessary to lower the fuel level depending on operating conditions.
8. Check fuel lines, tank, cap, and fittings frequently for cracks or leaks. Replace if necessary.
9. After refueling, tighten the fuel tank cap securely.
10. Wipe up any spilled fuel before starting the engine or allow the fuel to evaporate. Spilled fuel is
both a fire hazard and an environmental hazard.
DRAINING THE FUEL TANK AND CARBURETOR
1. Place an approved container below the carburetor and use a funnel to avoid spilling fuel.
2. Remove the drain bolt.
3. After all of the fuel has drained into the container, reinstall the drain bolt and washer. Tighten
the drain bolt securely.

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8236275 V 2.9
MAINTENANCE
The following section includes a maintenance schedule, routine inspection procedures and simple
maintenance procedures using basic hand tools. Service tasks that are more difficult or require special
tools are best handled by a technician or other qualified mechanic.
1. Maintain the engine with care. A well maintained engine is efficient, easier
to control and will prevent
unnecessary problems.
2. Sustained high-load or high-temperature operation, or use in unusually wet or dusty conditions
will require more frequent servicing.
3. Follow instructions for servicing
4. Inspect the engine components
periodically. Have damaged or worn
components repaired or replaced by
an authorized technician.
5. Maintain the engine’s label and
name plate. These carry important
information. If unreadable or
missing, contact Princess Auto Ltd.
for replacements.
CAUTION! Only qualified service personnel
should repair the engine.
MAINTENANCE SCHEDULE
This schedule applies to normal operating
conditions. If you operate your engine under
severe conditions, such as sustained high-load or high-temperature operation, or use in unusually wet or
dusty conditions, consult a qualified technician for recommendations applicable to your individual needs
and use.
Fig 3

140cc OHV Vertical Gas Engine
10
For technical questions call: 1-800-665-8685
8236275V 2.9
MAINTENANCE CHART
First 5 Hours Change oil
Every 8 Hours or Daily Check engine oil level
Clean the air filter
Every 50 Hours or Annual Change engine oil
Check muffler, muffler guard, spark arrestor (if applicable)
and flywheel brake pad (A types)
Annual Replace spark plug
Clean spark arrestor (if applicable), fuel tank and filter
Check and adjust (if necessary) the idle speed
Check and adjust (if necessary) the valve clearance
PERFORMING MAINTENANCE
WARNING! Always ensure that the engine is off before you begin any maintenance or repairs.
WARNING! Use only a nonflammable solvent, not gasoline, to clean engine parts.
Keep cigarettes, sparks, and flames away from all fuel related parts.
Before performing adjustments or repairs:
1. Disconnect the spark plug wire and keep it away from the spark plug.
a. Disconnect battery at negative terminal (only engines with electric start).
2. Replacement parts must be the same and installed in the same position as the original parts.
3. Do not strike the flywheel with a hammer or hard object. The flywheel may later
shatter during operation.
CARBURETOR ADJUSTMENT
Never make adjustments to the carburetor. The carburetor was set at the factory to operate efficiently
under most conditions. However, if adjustments are required, contact Princess Auto Ltd. for a solution.