SKU 66523
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Page 17
TROuBLESHOOTING - ENGINE
Problem
Possible Causes
Probable Solutions
Engine misfires
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 91+ octane
4.
unleaded 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
flow.
Improper idle speed.
4.
Faulty magneto, incorrect timing, or
5.
clogged carburetor.
Fill engine oil to proper level.
1.
Check engine oil before EVERY
use.
Fill fuel tank with fresh 91+ octane
2.
unleaded gasoline.
Test/replace fuel tank cap.
3.
Properly adjust idle speed.
4.
Have qualified technician diagnose
5.
and service engine.
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 91+ octane
1.
unleaded gasoline.
Do not exceed equipment’s load
2.
rating.
Have qualified technician diagnose
3.
and service engine.
Engine backfires
Impure or low quality gasoline.
1.
Engine too cold.
2.
Choke not open after engine warm.
3.
Engine not properly adjusted for
4.
high altitude operation.
Intake valve stuck, choke stuck,
5.
incorrect timing, clogged carburetor,
or overheated engine.
Fill fuel tank with fresh 91+ octane
1.
unleaded gasoline.
Use cold weather fuel and oil
2.
additives to prevent backfiring.
Move choke to run position after
3.
engine warms up.
Qualified technician must adjust
4.
engine at altitudes greater than
5,000 feet above sea level.
Have qualified technician diagnose
5.
and service engine.
Follow all safety precautions whenever diagnosing or servicing the
equipment or engine.
