2011 Arctic Cat 400 TRV ATV Service Manual, Page 34Get this manual
Measuring Piston Pin, Connecting Rod Small End, and Piston-Pin Bore 1Measure the piston pin outside diameter at each end and in the centerIf measurement exceeds specifications, the piston pin must be replaced CC400D
2Remove each ring by working it toward the top of the piston while rotating it out of the grooveNOTE: If the existing rings will not be replaced with new ones, note the location of each ring for proper installationWhen installing new rings, install as complete set only
ATV-1070
CleaningInspecting Piston Rings 1Take an old piston ring and snap it into two pieces; then grind the end of the old ring to 45 angle and to sharp edge2Using the sharpened ring as tool, clean carbon from the ring groovesBe sure to position the ring with its tapered side up
2Inspect and measure the connecting rod small endIf the measurement exceeds specifications, the connecting rod must be replaced (see Center Crankcase Components in this section)3Insert an inside dial indicator into the piston-pin boreTake two measurements to ensure accuracyThe diameter must not exceed specificationsIf the diameter exceeds specifications, the piston must be replaced