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SKU 94187 For technical questions, please call 1-800-444-3353
Abnormal Engine Noise
Symptom Probable Cause Possible Remedy
Noise of piston banging, or
other metal-on-metal
1. Piston, piston ring, or cylinder
worn.
2. Tie rod, piston pin and hole
worn.
3. Crankshaft main bearing
worn.
4. Piston ring broken.
5. Carbon deposits in
combustion chamber.
6. Spark plug gap too small.
7. Using wrong gasoline.
8. Engine running too hot.
9. Incorrect valve clearance.
10. Flywheel not tightly
connected to crankshaft.
1. Replace worn parts.
2. Replace worn parts.
3. Replace main bearing.
4. Replace piston ring.
5. Clean combustion chamber.
6. Adjust electrode clearance.
7. Empty gas tank and refill with
proper gasoline.
8. See Troubleshooting
Excessively Hot Engine.
9. Readjust valve clearance.
10. Retighten flywheel.