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Troubleshooting Guide-Engine
Problem
Possible Causes
Probable Solutions
Engine misfire
Spark plug wire loose.
1.
Incorrect spark plug gap or damaged
2.
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 and 2-cycle oil mixture.
Diagnose and repair compression. (Use
5.
Engine will not start: C
RELATED
section.)
Engine stops
suddenly
Fuel tank empty or full of impure or low
1.
quality gasoline.
Defective fuel tank cap creating
2.
vacuum, preventing proper fuel flo .
Improper idle speed.
3.
Faulty magneto, incorrect timing, or
4.
clogged carburetor.
Fill fuel tank with fresh 89+ octane
1.
unleaded gasoline and 2-cycle oil
mixture.
Test/replace fuel tank cap.
2.
Properly adjust idle speed.
3.
Have qualified technician diagnose and
4.
service engine.
Engine knocks
Old or low quality gasoline.
1.
Engine overloaded.
2.
Incorrect spark timing, deposit buildup,
3.
worn engine, or other mechanical
problems.
Fill fuel tank with fresh 89+ octane
1.
unleaded gasoline and 2-cycle oil
mixture.
Do not exceed equipment s load rating.
2.
Have qualified technician diagnose and
3.
service engine.
Engine backfire
Impure or low quality gasoline.
1.
Engine too cold.
1.
Choke not open after engine warm.
2.
Engine not properly adjusted for high
3.
altitude operation.
Intake valve stuck, choke stuck,
4.
incorrect timing, clogged carburetor, or
overheated engine.
Fill fuel tank with fresh 89+ octane
1.
unleaded gasoline and 2-cycle oil
mixture.
Use cold weather fuel and oil additives
2.
to prevent backfiring
Move choke to run position after engine
3.
warms up.
Qualified technician must adjust engine
4.
at altitudes greater than 5,000 feet
above sea level.
Have qualified technician diagnose and
5.
service engine.
