2001 Arctic Cat ATVs factory service and repair manual, Page 216Get this manual
2Using feeler gauge, measure each piston-ring end gapAcceptable ring end gap must be maximum 0.70 mm (0.028 in 1st ring and 1.0 mm (0.039 in 2nd ring for the 250300 cc, maximum 0.50 mm (0.020 in both rings for the 400 cc, and maximum 0.70 mm (0.028 in both rings for the 500 ccFig3-796
2Insert an inside dial indicator into the piston-pin boreThe diameter must be maximum 17.030 mm (0.6705 in for the 250300 cc, 21.03 mm (0.828 in for the 400 cc, and 23.03 mm (0.907 in for the 500 ccTake two measurements to ensure accuracyFig3-799
ATV1069
Measuring Piston Skirt Cylinder Clearance
Fig3-797
1Measure the cylinder front to back in six placesFig3-800