11-2
Engine
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 - seated poorly
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. Repair - replace guides
3. Time camshafts
4. Replace rings
5. Replace - rebore cylinder
6. Tighten plug
7. See Electrical in this section
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)
Condition Remedy
1. Gas tank vent hose obstructed
2. Carburetor inlet needle defective
3. Fuel hose obstructed
4. Fuel screens obstructed
5. Fuel valve clogged - defective
1. Clean vent hose
2. Replace needle
3. Clean - replace hose
4. Clean - replace inlet screen - valve screen
5. Clean - replace valve
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. Tappet(s) worn
4. Camshaft worn
1. Adjust clearance
2. Replace spring(s)
3. Replace tappet(s) and camshaft(s)
4. Replace camshaft
Problem: Engine noisy (Noise seems to come from piston)
Condition Remedy
1. Piston - cylinder worn
2. Combustion chamber carbon buildup
3. Piston pin - piston pin bore worn
4. Piston rings - ring groove(s) worn
1. Replace - service piston - cylinder
2. Clean chamber
3. Replace - service pin - bore
4. Replace rings - piston
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