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Page 16SKU 97964 For technical questions, please call 1-800-444-3353.
Troubleshooting
Problem Possible Cause Possible Solution
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 2.
or low quality gasoline.
Defective fuel tank cap creating 3.
vacuum, preventing proper fuel ow.
Improper idle speed.4.
Faulty magneto, incorrect timing, 5.
or clogged carburetor.
Fill engine oil to proper level. Check 1.
engine oil before EVERY use.
Fill fuel tank with fresh 89+ octane 2.
unleaded gasoline.
Test/replace fuel tank cap. 3.
Properly adjust idle speed.4.
Have qualied 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 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.
Choke not open after engine 3.
warm.
Engine not properly adjusted for 4.
high altitude operation.
Intake valve stuck, choke 5.
stuck, incorrect timing, clogged
carburetor, or overheated engine.
Fill fuel tank with fresh 89+ octane 1.
unleaded gasoline.
Use cold weather fuel and oil 2.
additives to prevent backring.
Move choke to run position after 3.
engine warms up.
Qualied technician must adjust 4.
engine at altitudes greater than 5,000
feet above sea level.
Have qualied technician diagnose 5.
and service engine.
Follow all safety precautions whenever diagnosing or servicing the
equipment or engine.
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not avail-
able individually as replacement parts.