2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 118Get this manual
Electrical System Problem: Spark absent or weak Condition 1Ignition coil defective
2Spark plug defective 3Magneto defective 4CDI unit defective
Remedy 1Replace ignition coil
2Replace plug 3Replace magneto 4Replace CDI unit
Problem: Spark plug fouled with carbon Condition 1Idle RPM too high
2Gasoline incorrect 3Air filter element dirty 4Spark plug incorrect (too cold)
Remedy 1Adjust carburetor
2Change to correct gasoline 3Clean element 4Replace plug with proper heat range
Problem: Spark plug electrodes overheat or burn Condition 1Spark plug incorrect (too hot)
2Engine overheats 3Spark plug loose Problem: Magneto does not charge Condition 1Lead wiresconnections shortedlooseopen 2Magneto coils shortedgroundedopen 3Regulatorrectifier shortedpunctured
Remedy 1Replace plug
2Check cooling fan air intake blockage damage to fancooling shroud 3Tighten plug
Remedy 1Repairreplacetighten lead wires