2008 Arctic Cat DVX 400 ATV Service Manual, Page 142Get this manual
Engine Problem: 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 Time camshafts Replace rings Replacerebore cylinder Tighten plug See Electrical in this section
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 carburetor) Condition
12345Gas tank vent hose obstructed Carburetor inlet needle defective Fuel hose obstructed Fuel screens obstructed Fuel valve cloggeddefective