2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 75Get this manual

2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 75

CleaningInspecting Piston Rings 1Take an old piston ring and snap it into two pieces; then grind the end of the old ring
mm (0.039 in 2nd ring Measuring Piston Skirt Cylinder Clearance 1Measure the cylinder front to back in six places Measuring
Piston Pin (Outside Diameter) and Piston-Pin Bore 2Measure the corresponding piston diameter at point 18 mm (0.71 in above
the piston skirt at right angle to the piston-pin boreSubtract this measurement from the measurement in step 1The difference
(clearance) must be maximum 0.12 mm (0.0047 inInstalling Piston Rings 1Measure the piston pin outside diameter at each end
and in the centerIf measurement is less than 16.98 mm (0.6685 in, the piston pin must be replaced 1Install thin oil ring
(3), ring expander (4), and thin oil ring (3) in the bottom groove of the pistonStagger the end gaps of the upper and lower
thin oil rings according to the illustration NOTE: Note the direction of the exhaust side of the piston (5) for correct ring