2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 367Get this manual
Troubleshooting Problem: Spark absent or weak Condition 1Ignition coil defective 2Spark plug defective 3Magneto defective 4CDI unitECU defective 5Pick-up coil defective Problem: Spark plug fouled with carbon Condition 1Mixture too rich 2Idling RPM too high 3Gasoline incorrect 4Air cleaner element dirty 5Spark plug incorrect (too cold) 6Valve seals crackedmissing 7Oil rings wornbroken Problem: Spark plug electrodes overheat or burn Condition 1Spark plug incorrect (too hot) 2Engine overheats 3Spark plug loose 4Mixture too lean Problem: Magneto does not charge Condition 1Lead wiresconnections shortedlooseopen 2Magneto coils shortedgroundedopen 3Regulatorrectifier defective