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5-7
5
Troubleshooting
Problem: Spark absent or weak
Condition
Remedy
1.
Ignition coil
defective
2.
Spark plug
defective
3.
Magneto
defective
4.
CDI unit
defective
1. Replace ignition coil
2. Replace plug
3. Replace magneto
4. Replace CDI unit
Problem: Spark plug fouled with carbon
Condition
Remedy
1.
Idle RPM
too high
2.
Gasoline
incorrect
3.
Air filter
elemen
t dirty
4.
Spark plug
incorrect (too cold)
1. Adjust carburetor
2. Change to correct gasoline
3. Clean element
4. Replace plug with proper heat range
Problem: Spark plug electrodes overheat or burn
Condition
Remedy
1.
Spark plug
incorrect (too hot)
2.
Engine
overheats
3.
Spark plug
loose
1. Replace plug
2. Check cooling fan air intake blockage -
damage to fan - cooling shroud
3. Tighten plug
Problem: Magneto does not charge
Condition
Remedy
1.
Lead wires - connections
shorted
- loose - open
2.
Magneto coils
shorted - grounded - open
3.
Regulator/rectifier
shorted - punctured
1. Repair - replace - tighten lead wires
2. Replace magneto coils
3. Replace regulator/rectifier
Problem: Magneto charges, but charging rate is below the specification
Condition
Remedy
1.
Lead wires
shorted - open - loose (at terminals)
2.
Stator coils (magneto)
grounded - open
3.
Regulator/rectifier
defective
4.
Cell plates (battery)
defective
1. Repair - tighten lead wires
2. Replace stator coils
3. Replace regulator/rectifier
4. Replace battery
Problem: Magneto overcharges
Condition
Remedy
1.
Internal battery
short circuited
2.
Regulator/rectifier resistor
damaged - defective
3.
Regulator/rectifier
poorly grounded
1. Replace battery
2. Replace resistor
3. Clean - tighten ground connection
Problem: Charging unstable
Condition
Remedy
1.
Lead wire
intermittently shorting
2.
Magneto
internally shorted
3.
Regulator/rectifier
defective
1. Replace lead wire
2. Replace magneto
3. Replace regulator/rectifier
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