3-36
Troubleshooting
Problem: Engine will not start or is hard to start (Compression too low)
Condition
Remedy
1.
Piston rings
worn excessively
2.
Cylinder bore
worn
3.
Spark plug
seating poorly
4.
Starter motor
cranks too slowly - does not turn
5.
Valves
burned -
tappets
adjusted too tight
1. Replace rings
2. Replace - rebore cylinder
3. Tighten plug
4. See Electrical in this section
5. Replace valves - adjust tappets
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
1. Clean vent hose
2. Replace needle
3. Clean - replace hose
4. Clean - replace inlet screen - valve screen
Problem: Engine stalls easily
Condition
Remedy
1.
Spark plug
fouled
2.
Magneto
defective
3.
CDI unit
defective
4.
Carburetor jets
obstructed
1. Clean plug
2. Replace magneto
3. Replace CDI unit
4. Clean jets
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
Problem: Engine noisy (Noise seems to come from clutch)
Condition
Remedy
1.
Clutch shoe(s)
worn
2.
Driven clutch hub
warped - worn
1. Replace clutch shoe(s)
2. Replace clutch
Problem: Engine noisy (Noise seems to come from crankshaft)
Condition
Remedy
1.
Bearing
worn - burned
2.
Lower rod-end bearing
worn - burned
3.
Connecting rod side clearance
too large
4.
Engine oil
low - incorrect grade
1. Replace bearing
2. Replace bearing
3. Replace thrust washer(s)
4. Fill crankcase with recommended engine oil
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