2008 Arctic Cat ATVs factory service and repair manual, Page 168Get this manual
Measuring Piston Pin (Outside Diameter) and Piston-Pin Bore
1Measure the piston pin outside diameter at each end and in the centerIf measurement is not within specifications, the piston pin must be replaced
2Measure the corresponding piston diameter at point 15 mm (0.6 in above the piston skirt at right angle to the piston-pin boreSubtract this measurement from the measurement in step lThe difference (clearance) must be within specificationsInstalling Piston Rings
1Install ring expander (4) in the bottom groove of the piston; then install the thin oil rings (3) over the expander making sure the expander ends do not overlapStagger the end gaps of the upper and lower thin oil rings according to the illustration# Compression 1
Ring End Gap
ATV-I 071
2Insert an inside dial indicator into the piston-pin boreThe diameter must not exceed specificationsTake two measurements to ensure accuracyCompression Ring End Gap