2008 Arctic Cat 366 ATV Service Manual, Page 31Get this manual
Troubleshooting Problem: Engine will not start or is hard to start (Compression too low) Condition
1234567Valve clearance out of adjustment Valve guides worn Valves mistimed Piston rings worn excessively Cylinder bore worn Spark plug seating poorly Starter motor cranks too slowlydoes not turn
1234567Adjust clearance Replace cylinder head Adjust valve timing Replace rings Replacerebore cylinder Tighten plug Checkreplace starter motor
Problem: Engine will not start or is hard to start (No spark) Condition
123456Spark plug fouled Spark plug wet Magneto defective CDI unit defective Ignition coil defective High-tension lead openshorted
123456Cleanreplace plug Cleandry plug Replace magneto Replace CDI unit Replace ignition coil Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the carburetorfuel injector) Condition
12345Gas tank vent hose obstructed Carburetor float valve defective Fuel hose obstructed Fuel screens obstructed Fuel pump defective