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ITEM 61614
SAFETY
Op
ERA
TION
M
AINTENANCE
SETU
p
problem
possible Causes
probable Solutions
Engine misfires
1. Spark plug caps loose.
2. Incorrect spark plug gaps or
damaged spark plugs.
3. Defective spark plug caps.
4. Old or low quality gasoline.
5. Incorrect compression.
1. Check wire connections.
2. Re-gap or replace spark plugs.
3. Replace spark plug caps.
4. Use only fresh 87+ octane
s
tabilizer-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.)
Engine stops
suddenly
1. Fuel tank empty or full of impure or
low quality gasoline.
2. Low oil shutdown.
3. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.
4. Faulty magneto.
5. Disconnected or improperly
connected spark plug caps.
6. Starter motor has overheated.
1. Fill fuel tank with fresh 87+ octane
stabilizer-treated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).
2. Fill engine oil to proper level.
Check engine oil before EVERY use.
3. Test/replace fuel tank cap.
4. Have qualified technician service magneto.
5. Secure spark plug caps.
6. Allow starter motor to cool, then press
circuit breaker button on control panel.
Do not use starter for more than
a few seconds at a time.
Engine stops when
under heavy load
1. Dirty air filter.
2. Engine running cold.
1. Clean or replace element.
2. Allow engine to warm up prior
to operating equipment.
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.
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.
Engine backfires
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.
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.
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
