2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 42Get this manual
Troubleshooting NOTE: ConditionRemedy marked with an asterisk () is for manual transmission models onlyProblem: Engine will not start or is hard to start (Compression too low) Condition
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
123456Spark plug fouled Spark plug wet Magneto defective CDI unitECU defective Ignition coil defective High-tension lead openshorted
123456Cleanreplace plug Cleandry plug Replace magneto Replace CDI unitECU 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