2009 Arctic Cat 400/500/550/700/550/700/1000 ATV Service Manual, Page 290Get this manual
Troubleshooting Problem: Spark absent or weak Condition
12345Ignition coil defective Spark plug defective Magneto defective CDI unitECU defective Pick-up coil defective
12345Replace ignition coil Replace plug Replace magneto Replace CDI unitECU Replace pick-up coil
Problem: Spark plug fouled with carbon Condition
1234567Mixture too rich (400500) Idling RPM too high (400500) Gasoline incorrect Air cleaner element dirty Spark plug incorrect (too cold) Valve seals crackedmissing Oil rings wornbroken
1234567Adjust carburetor Adjust carburetor Change to correct gasoline Clean element Replace plug Replace seals Replace rings
Problem: Spark plug electrodes overheat or burn Condition
1234Spark plug incorrect (too hot) Engine overheats Spark plug loose Mixture too lean (400500)
1234Replace plug Service cooling system Tighten plug Adjust carburetor
Problem: Magneto does not charge Condition
1Lead wiresconnections shortedlooseopen 2Magneto coils shortedgroundedopen 3Regulatorrectifier defective