2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 115Get this manual
Problem: Engine idles poorly Condition 1Magneto defective 2CDI unit defective 3Spark plug fouledgap too wide 4Ignition coil defective 5Float level out of adjustment 6Carburetor jets obstructed 7Pilot screw setting improper Problem: Engine runs poorly at high speed Condition 1Spark plug gap too narrow 2Ignition coil defective 3Float level too low 4Air cleaner element obstructed 5Fuel hose obstructed 6Carburetor jets obstructed 7Air filter inlet pipe obstructed
Remedy 1Replace magneto
2Replace CDI unit 3Adjust gapreplace plug 4Replace ignition coil 5Adjust float height 6Clean jets 7Adjust pilot screw
Remedy 1Adjust gap
2Replace ignition oil 3Adjust float arm height 4Clean element 5Cleanprime hose 6Clean jets 7Remove obstruction
Problem: Exhaust smoke dirty or heavy Condition 1Piston ringscylinder worn
2Cylinder wall scoredscuffed 3Crankcase over-full of oil 4Air filter too much air filter element oil 5Carburetor jets incorrect size (too big)