Predator 4375 - Troubleshooting Engine Performance; Engine Load and Misfire Issues; Engine Knock and Backfire

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Engine stops when
under heavy load
1. Dirty air lter.
2. Engine running cold.
1. Clean or replace element.
2. Allow engine to warm up prior
to operating equipment.
Engine misres 1. Spark plug cap loose.
2. Incorrect spark plug gap or
damaged spark plug.
3. Defective spark plug cap.
4. Old or low quality gasoline.
5. Incorrect compression.
1. Check wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug cap.
4. Use only fresh 87+ octane stabilizer
treated unleaded gasoline.&
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5. Diagnose and repair compression.
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Engine stops
suddenly
1. Low oil shutdown.
2. Fuel tank empty or full of impure or low
quality gasoline.
3. Defective fuel tank cap creating
vacuum, preventing proper fuel ow.
4. Faulty magneto.
5. Disconnected or improperly
connected spark plug cap.
1. Fill engine oil to proper level. Check
engine oil before EVERY use.
2. Fill fuel tank with fresh 87+ octane
stabilizer treated unleaded gasoline.&
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3. Test/replace fuel tank cap.
4. Have qualied technician service magneto.
5. Secure spark plug cap.
Engine knocks 1. Old or low quality gasoline.
2. Engine overloaded.
3. Incorrect spark timing, deposit
buildup, worn engine, or other
mechanical problems.
1. Fill fuel tank with fresh 87+ octane
stabilizer treated unleaded gasoline. &&
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2. Do not exceed equipment’s load rating.
3. Have qualied technician
diagnose and service engine.
Engine backres 1. Impure or low quality gasoline.
2. Engine too cold.
3. Intake valve stuck or overheated engine.
4. Incorrect timing.
1. Fill fuel tank with fresh 87+ octane
stabilizer treated unleaded gasoline. &&
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2. Use cold weather fuel and oil
additives to prevent backring.
3. Have qualied technician
diagnose and service engine.
4. Check engine timing.
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