Probable Solutions - Predator Engines 420cc Owner's Manual & Safety Instructions

problem
Engine misfires 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.
Engine stops 1. Low oil shutdown.
suddenly
2. Fuel tank empty or full of impure or low
quality gasoline.
3. Defective fuel tank cap creating
vacuum, preventing proper fuel flow.
4. Faulty magneto.
5. Disconnected or improperly
connected spark plug cap.
Engine stops when 1. Dirty air filter
under heavy load
2. Engine running cold.
Engine knocks 1. Old or low quality gasoline.
2. Engine overloaded.
3. Incorrect spark timing, deposit
buildup, worn engine, or other
mechanical problems.
Engine backfires 1. Impure or low quality gasoline.
2. Engine too cold.
3. Intake valve stuck or overheated engine.
4. Incorrect timing.
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
ITEM 69736
possible Causes
For technical questions, please call 1-800-520-0882.

probable Solutions

1. Check wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug cap.
4. Use only fresh 87+ octane
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
5. Diagnose and repair compression.
(Use Engine will not start:
COMpRESSION RELATED section.)
1. Fill engine oil to proper level.
Check engine oil before EVERY use.
2. Fill fuel tank with fresh 87+ octane
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
3. Test/replace fuel tank cap.
4. Have qualified technician
service magneto.
5. Secure spark plug cap.
1. Clean or replace element.
2. Allow engine to warm up prior
to operating equipment.
1. Fill fuel tank with fresh 87+ octane
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
2. Do not exceed equipment's load rating.
3. Have qualified technician
diagnose and service engine.
1. Fill fuel tank with fresh 87+ octane
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
2. Use cold weather fuel and oil
additives to prevent backfiring.
3. Have qualified technician
diagnose and service engine.
4. Check engine timing.
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