2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 114Get this manual
EngineTransmission Problem: Engine will not start or is hard to start (Compression too low) Condition Remedy 1Piston rings worn excessively 1Replace rings
2Cylinder bore worn 3Spark plug seating poorly 4Starter motor cranks too slowlydoes not turn 2Replacerebore cylinder 3Tighten plug 4See Electrical in this section
5Valves burnedtappets adjusted too tight 5Replace valvesadjust tappets Problem: Engine will not start or is hard to start (No spark) Condition Remedy 1Spark plug fouled 1Cleanreplace plug 2Spark plug wet 3Magneto defective 4CDI unit defective 5Ignition coil defective 2Cleandry plug 3Replace magneto 4Replace CDI unit 5Replace ignition coil
6High-tension lead openshorted 6Replace high tension lead Problem: Engine will not start or is hard to start (No fuel reaching the carburetor) Condition Remedy 1Gas tank vent hose obstructed 1Clean vent hose 2Carburetor inlet needle defective 3Fuel hose obstructed 4Fuel screens obstructed Problem: Engine stalls easily Condition 1Spark plug fouled 2Magneto defective 3CDI unit defective 2Replace needle 3Cleanreplace hose 4Cleanreplace inlet screenvalve screen