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Troubleshooting
Problem Possible Causes Probable Solutions
Engine misres Spark plug wire loose.1.
Incorrect spark plug gap or 2.
damaged spark plug.
Defective spark plug wire.3.
Old or low quality gasoline. 4.
Incorrect compression.5.
Check wire connections.1.
Re-gap or replace spark plug. 2.
Replace spark plug wire.3.
Use only fresh 89+ octane unleaded 4.
gasoline.
Diagnose and repair compression. 5.
(Use Engine will not start:
COMPRESSION RELATED
section.)
Engine stops suddenly Low oil shutdown. 1.
Fuel tank empty or full of impure or 2.
low quality gasoline.
Defective fuel tank cap creating 3.
vacuum, preventing proper fuel ow.
Faulty magneto.4.
Fill engine oil to proper level. 1.
Check engine oil before EVERY
use.
Fill fuel tank with fresh 89+ octane 2.
unleaded gasoline.
Test/replace fuel tank cap. 3.
Have qualied technician service 4.
magneto.
Engine knocks Old or low quality gasoline. 1.
Engine overloaded. 2.
Incorrect spark timing, deposit 3.
buildup, worn engine, or other
mechanical problems.
Fill fuel tank with fresh 89+ octane 1.
unleaded gasoline.
Do not exceed equipment’s load 2.
rating.
Have qualied technician diagnose 3.
and service engine.
Engine backres Impure or low quality gasoline. 1.
Engine too cold. 2.
Intake valve stuck or overheated 3.
engine.
Fill fuel tank with fresh 89+ octane 1.
unleaded gasoline.
Use cold weather fuel and oil 2.
additives to prevent backring.
Have qualied technician diagnose 3.
and service engine.
Does not produce high
pressure
Diameter of water supply hose too 1.
small
Water supply is restricted. 2.
Not enough water supply.3.
Replace hose with a ¾ inch hose. 1.
Check water supply hose for kinks, 2.
leaks, or blockage.
Open water faucet all the way.3.
Follow all safety precautions whenever diagnosing or servicing the
equipment or engine.