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TROUBLESHOOTING - ENGINE
Problem Possible Causes Probable Solutions
Engine misres
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.
2.
Replace spark plug wire.3.
Use only fresh 89+ octane unleaded 4.
Diagnose and repair compression. (Use 5.
Engine will not start: COMPRESSION
RELATED section.)
Engine stops
suddenly
Fuel tank empty or full of impure or low 1.
quality gasoline.
Defective fuel tank cap creating 2.
Improper idle speed.3.
Faulty magneto, incorrect timing, or 4.
clogged carburetor.
Fill fuel tank with fresh 89+ octane 1.
mixture.
Test/replace fuel tank cap. 2.
Properly adjust idle speed.3.
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.
mixture.
Do not exceed equipment’s load rating.2.
3.
service engine.
Engine backres
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.
mixture.
Use cold weather fuel and oil additives 2.
Move choke to run position after engine 3.
warms up.
4.
at altitudes greater than 5,000 feet
above sea level.
5.
service engine.
Follow all safety precautions whenever diagnosing or servicing the
equipment or engine.