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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. Fuel tank empty or full of impure or low
quality gasoline.
suddenly
2. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.
3. Faulty magneto.
4. 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.
After sudden
Shaft key or other shear pin
broken by impact to disconnect
impact, engine will
engine and limit damage.
run, but equipment
will not operate
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
ITEM 57531
possible Causes
For technical questions, please call 1-888-866-5797.
probable Solutions
1. Check cap and wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug cap.
4. Use only fresh 91+ octane stabilizer-treated
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 fuel tank with fresh 91+ octane
stabilizer-treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
2. Test/replace fuel tank cap.
3. Have qualified technician service magneto.
4. Secure spark plug cap.
1. Clean element.
2. Allow engine to warm up prior
to operating equipment.
1. Fill fuel tank with fresh 91+ octane
stabilizer-treated 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 91+ octane
stabilizer-treated 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.
Have qualified technician check and replace
broken shaft key or other shear pins.
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