2008 Arctic Cat DVX 250 / 250 Utility ATV Service Manual, Page 76Get this manual
Problem: Engine idles poorly Condition 1Valve clearance out of adjustment 2Valve seating poor 3Valve guides defective 4Rocker armsarm shaft worn 5Magneto defective 6CDI unit defective 7Spark plug fouledgap too wide 8Ignition coil defective 9Float out of adjustment 10Jets obstructed 11Pilot screw setting improper Problem: Engine runs poorly at high speed Condition 1High RPM "cut out" against RPM limiter 2Valve springs weak 3Valve timing out of adjustment 4Camsrocker arms worn 5Spark plug gap too narrow 6Ignition coil defective 7Float level too low 8Air cleaner element obstructed 9Fuel hose obstructed Problem: Exhaust smoke dirty or heavy Condition 1Oil (in the engine) overfilledcontaminated 2Piston ringscylinder worn 3Valve guides worn 4Cylinder wall scoredscuffed 5Valve stems worn 6Stem seals defective 7Air cleaner element obstructed 8Float level too high 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 7Rocker armsshafts 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