3-4
Troubleshooting
Problem: Engine will not start or is hard to start (Compression too low)
Condition Remedy
1. Valve clearance out of adjustment
2. Valve guides worn
3. Valves mistimed
4. Piston rings worn excessively
5. Cylinder bore worn
6. Spark plug seating poorly
7. Starter motor cranks too slowly - does not turn
1. Adjust clearance
2. Replace cylinder head
3. Adjust valve timing
4. Replace rings
5. Replace - rebore cylinder
6. Tighten plug
7. Check - replace starter motor
Problem: Engine will not start or is hard to start (No spark)
Condition Remedy
1. Spark plug fouled
2. Spark plug wet
3. Magneto defective
4. CDI unit defective
5. Ignition coil defective
6. High-tension lead open - shorted
1. Clean - replace plug
2. Clean - dry plug
3. Replace magneto
4. Replace CDI unit
5. Replace ignition coil
6. Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the carburetor/fuel injector)
Condition Remedy
1. Gas tank vent hose obstructed
2. Carburetor float valve defective
3. Fuel hose obstructed
4. Fuel screens obstructed
5. Fuel pump defective
1. Clean vent hose
2. Replace valve
3. Clean - replace hose
4. Clean - replace inlet screen - valve screen
5. Replace fuel pump
Problem: Engine stalls easily
Condition Remedy
1. Spark plug fouled
2. Magneto defective
3. CDI unit defective
4. Carburetor jets obstructed
5. Valve clearance out of adjustment
1. Clean plug
2. Replace magneto
3. Replace CDI unit
4. Clean jets
5. Adjust clearance
Problem: Engine noisy (Excessive valve chatter)
Condition Remedy
1. Valve clearance too large
2. Valve spring(s) weak - broken
3. Rocker arm - rocker arm shaft worn
4. Camshaft worn
5. Valve tappets worn
1. Adjust clearance
2. Replace spring(s)
3. Replace arm - shaft
4. Replace camshaft
5. Replace tappets
Problem: Engine noisy (Noise seems to come from piston)
Condition Remedy
1. Piston - cylinder worn
2. Combustion chamber carbon buildup
3. Piston pin bore worn
4. Piston pin worn
5. Piston rings - ring groove(s) worn
1. Replace - service piston - cylinder
2. Clean chamber
3. Replace piston
4. Replace piston pin
5. Replace rings - piston
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