2008 Arctic Cat ThunderCat ATV Service Manual, Page 27Get this manual
Troubleshooting Problem: Engine will not start or is hard to start (Compression too low) Condition Remedy
1234567Valve clearance out of adjustment Valve guides wornseated poorly Valves mistimed Piston rings worn excessively Cylinder bore worn Spark plug seating poorly Starter motor cranks too slowlydoes not turn 1234567Adjust clearance Repairreplace guides Adjust valve timing Replace rings Replacerebore cylinder Tighten plug See SectionTroubleshooting
Problem: Engine will not start or is hard to start (No spark) Condition Remedy
123456Spark plug fouled Spark plug wet Crankshaft position sensor defective ECU defective Ignition coil defective High-tension lead openshorted 123456Cleanreplace plug Cleandry plug Replace CKP sensor Replace ECU Replace ignition coil Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the fuel injector) Condition Remedy
1234Gas tank vent hose obstructed Fuel hose obstructed Fuel screens obstructed Fuel pump defective 1234Clean vent hose Cleanreplace hose Cleanreplace inlet screenvalve screen Replace fuel pump