2011 Arctic Cat 366SE ATV Service Manual, Page 23Get this manual
Problem: Engine noisy (Noise seems to come from secondary bevel gear and final driven shaft) Condition Remedy 1234567Drivedriven bevel gears damagedworn Backlash excessive Tooth contact improper Bearing damaged Gears wornrubbing Splines worn Final driven shaft thrust clearance too large 1234567Replace gears Adjust backlash Adjust contact Replace bearing Replace gears Replace shaft(s) Replace thrust washer(s)
Problem: Engine idles poorly Condition
1234567891011Valve clearance out of adjustment Valve seating poor Valve guides defective Rocker armsarm shaft worn Magneto defective CDI unit defective Spark plug fouledgap too wide Ignition coil defective Float out of adjustment Jets obstructed Pilot screw setting improper
1234567891011Adjust clearance Replaceservice seatsvalves Replace cylinder head Replace armsshafts Replace 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
12345678910High RPM "cut out" against RPM limiter Valve springs weak Valve timing out of adjustment Camsrocker armstappets worn Spark plug gap too narrow Ignition coil defective Float level too low Air cleaner element obstructed Fuel hose obstructed Fuel pump defective