2006 Arctic Cat ATVs factory service and repair manual, Page 329Get this manual
2Using feeler gauge, measure each piston-ring end gapAcceptable ring end gap must be within specifications Measuring Piston Skirt1 Cylinder Clearance
1Measure the cylinder front to back in six places
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 1The 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 illustrationAn is stamped on the piston to indicate front# Cmpression Ring End Gap