2006 Arctic Cat DVX 400 Service Manual, Page 159Get this manual
Problem: Exhaust smoke dirty or heavy Condition 1Piston ringscylinder worn 2Valve guides worn 3Cylinder wall scoredscuffed 4Valve stems worn 5Stem seals defective
Remedy 1Replaceservice ringscylinder
2Replace guides 3Replaceservice cylinder 4Replace valves 5Replace seals
Problem: Engine lacks power Condition 1Valve clearance incorrect
2Valve springs weak 3Valve timing out of adjustment 4Piston ring(s)cylinder worn 5Valve seating poor 6Spark plug fouled 7Tappet(s) worn 8Spark plug gap incorrect 9Carburetor jets obstructed 10Float level out of adjustment 11Air cleaner element obstructed 12Oil (in the engine) overfilledcontaminated 13Intake manifold leaking air 14Cam chain worn Problem: Engine overheats Condition 1Carbon deposit (piston crown) excessive 2Oil low 3Octane lowgasoline poor 4Oil pump defective 5Oil circuit obstructed 6Gasoline level (in float chamber) too low 7Intake manifold leaking air 8Coolant level low 9Fan malfunctioning 10Fan switch malfunctioning 11Thermostat stuckclosed 12Radiator hosescap damagedobstructed