2010 Arctic Cat DVX 90 / 90 Utility ATV Service Manual, Page 49Get this manual
Problem: Engine idles poorly Condition 1234567Magneto defective CDI unit defective Spark plug fouledgap too wide Ignition coil defective Float level out of adjustment Carburetor jets obstructed Pilot screw setting improper
1234567Replace magneto Replace CDI unit Adjust gapreplace plug Replace ignition coil Adjust float height Clean jets Adjust pilot screw
Problem: Engine runs poorly at high speed Condition
1234567Spark plug gap too narrow Ignition coil defective Float level too low Air cleaner element obstructed Fuel hose obstructed Carburetor jets obstructed Air filter inlet pipe obstructed
1234567Adjust gap Replace ignition oil Adjust float arm height Clean element Cleanprime hose Clean jets Remove obstruction
Problem: Exhaust smoke dirty or heavy Condition
12345Piston ringscylinder worn Cylinder wall scoredscuffed Crankcase over-full of oil Air filter too much air filter element oil Carburetor jets incorrect size (too big)