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Troubleshooting
Problem: Spark absent or weak
Condition
1. Ignition coil defective
2. Spark plug defective
3. Alternator defective
4. ECM defective
5. Pick-up coil defective
Problem: Spark plug fouled with carbon
Condition
1. Gasoline incorrect
2. Air cleaner element dirty
3. Spark plug incorrect (too cold)
4. Valve seals cracked - missing
5. Oil rings worn - broken
Problem: Spark plug electrodes overheat or burn
Condition
1. Spark plug incorrect (too hot)
2. Engine overheats
3. Spark plug loose
Problem: Alternator does not charge
Condition
1. Stator wires/connections shorted - loose - open
2. Stator coils shorted - grounded - open
3. Regulator/rectifier defective
Problem: Alternator charges, but charging rate is below the specification
Condition
1. Stator wires shorted - open - loose (at terminals)
2. Stator coils grounded - open
3. Regulator/rectifier defective
4. Battery defective
Problem: Alternator overcharges
Condition
1. Battery shorted
2. Regulator/rectifier damaged - defective
3. Regulator/rectifier poorly grounded
Problem: Charging unstable
Condition
1. Stator wire intermittently shorting
2. Alternator internally shorted
3. Regulator/rectifier defective
Problem: Starter button inoperative
Condition
1. Battery charge low
2. Switch contacts defective
3. Starter motor defective
4. Starter relay defective
5. Emergency stop - ignition switch off
6. Wiring connections loose - disconnected
Remedy
1. Replace ignition coil
2. Replace plug
3. Replace stator coil
4. Replace ECM
5. Replace stator coil
Remedy
1. Change to correct gasoline
2. Clean element
3. Replace plug
4. Replace seals
5. Replace rings
Remedy
1. Replace plug
2. Service cooling system
3. Tighten plug
Remedy
1. Repair - replace - tighten stator wires
2. Replace stator coils
3. Replace regulator/rectifier
Remedy
1. Repair - tighten stator wires
2. Replace stator coils
3. Replace regulator/rectifier
4. Replace battery
Remedy
1. Replace battery
2. Replace regulator/rectifier
3. Clean - tighten ground connection
Remedy
1. Replace stator wire
2. Replace stator coil
3. Replace regulator/rectifier
Remedy
1. Charge - replace battery
2. Replace switch
3. Replace starter motor
4. Replace relay
5. Turn on switches
6. Connect - tighten - repair connections
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Table of Contents
Troubleshooting
