5-13
5
Ignition Timing
The ignition timing cannot be adjusted; however, verify-
ing ignition timing can aid in troubleshooting other com-
ponents. To verify ignition timing, use the following
procedure.
1. Attach the Timing Light to the spark plug high ten-
sion lead; then remove the timing inspection plug
from the left-side crankcase cover.
2. Using the Tachometer, start the engine and run at
1500 RPM; ignition timing should be 10° BTDC.
3. Install the timing inspection plug.
If ignition timing cannot be verified, the rotor may be
damaged, the key may be sheared, the trigger coil bracket
may be bent or damaged, or the CDI unit may be faulty.
Troubleshooting
Problem: Spark absent or weak
Condition Remedy
1. Ignition coil defective
2. Spark plug defective
3. Magneto defective
4. CDI unit defective
5. Pick-up coil defective
1. Replace ignition coil
2. Replace plug
3. Replace stator coil
4. Replace CDI unit
5. Replace stator coil
Problem: Spark plug fouled with carbon
Condition Remedy
1. Gasoline incorrect
2. Air cleaner element dirty
3. Spark plug incorrect (too cold)
4. Valve seals cracked - missing
5. Oil rings worn - broken
6. Mixture too rich
7. Idling RPM too high
1. Change to correct gasoline
2. Clean element
3. Replace plug
4. Replace seals
5. Replace rings
6. Adjust carburetor
7. Adjust carburetor
Problem: Spark plug electrodes overheat or burn
Condition Remedy
1. Spark plug incorrect (too hot)
2. Engine overheats
3. Spark plug loose
4. Mixture too lean
1. Replace plug
2. Service cooling system
3. Tighten plug
4. Adjust carburetor
Problem: Battery does not charge
Condition Remedy
1. Lead wires/connections shorted - loose - open
2. Magneto coils shorted - grounded - open
3. Regulator/rectifier defective
1. Repair - replace - tighten lead wires
2. Replace magneto coils
3. Replace regulator/rectifier
Problem: Battery charges, but charging rate is below the specification
Condition Remedy
1. Lead wires shorted - open - loose (at terminals)
2. Stator coil (magneto) grounded - open
3. Regulator/rectifier defective
4. Cell plates (battery) defective
5. Electrolyte low (lead-acid)
1. Repair - tighten lead wires
2. Replace stator coil
3. Replace regulator/rectifier
4. Replace battery
5. Add distilled water
Problem: Battery 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 stator coil
3. Replace regulator/rectifier
FOR ARCTIC CAT ATV DISCOUNT PARTS CALL 606-678-9623 OR 606-561-4983
www.mymowerparts.com
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