Troubleshooting - Arctic Cat 300 Utility Service Manual

Troubleshooting

Problem: Spark absent or weak
Condition
1. Ignition coil defective
2. Spark plug defective
3. Magneto defective
4. CDI unit defective
5. Pick-up coil defective
Problem: Spark plug fouled with carbon
Condition
1. Mixture too rich
2. Idling RPM too high
3. Gasoline incorrect
4. Air cleaner element dirty
5. Spark plug incorrect (too cold)
6. Valve seals cracked - missing
7. 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
4. Mixture too lean
Problem: Magneto does not charge
Condition
1. Lead wires/connections shorted - loose - open
2. Magneto coils shorted - grounded - open
3. Regulator/rectifier defective
Problem: Magneto charges, but charging rate is below the specification
Condition
1. Lead wires shorted - open - loose (at terminals)
2. Stator coils (charging) grounded - open
3. Regulator/rectifier defective
4. Cell plates (battery) defective
Problem: Magneto overcharges
Condition
1. Internal battery short circuited
2. Regulator/rectifier defective
3. Regulator/rectifier poorly grounded
Problem: Charging unstable
Condition
1. Lead wire intermittently shorting
2. Magneto internally shorted
3. Regulator/rectifier defective
Problem: Starter button not effective
Condition
1. Battery charge low
2. Switch contacts defective
3. Starter motor brushes not seating
4. Starter relay defective
5. Emergency stop - ignition switch off
6. Wiring connections loose - disconnected
7. Starter bushings worn
8. Starter armature shorted - open
9. Brake switch defective
Problem: Battery "sulfation" (Acidic white powdery substance or spots on surfaces of cell plates)
Condition
1. Charging rate too low - too high
2. Specific gravity too low
3. Battery run-down - damaged
4. Electrolyte contaminated
Remedy
1. Replace ignition coil
2. Replace plug
3. Replace magneto
4. Replace CDI unit
5. Replace pick-up coil
Remedy
1. Adjust carburetor
2. Adjust carburetor
3. Change to correct gasoline
4. Clean element
5. Replace plug
6. Replace seals
7. Replace rings
Remedy
1. Replace plug
2. Service cooling system
3. Tighten plug
4. Adjust carburetor
Remedy
1. Repair - replace - tighten lead wires
2. Replace magneto coils
3. Replace regulator/rectifier
Remedy
1. Repair - tighten lead 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 lead wire
2. Replace magneto
3. Replace regulator/rectifier
Remedy
1. Recharge - replace battery
2. Replace switch
3. Repair - replace brushes
4. Replace relay
5. Turn on switches
6. Connect - tighten - repair connections
7. Replace starter
8. Replace starter
9. Replace switch
Remedy
1. Replace battery
2. Charge battery
3. Replace battery
4. Replace battery
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