2010 Arctic Cat DVX 90 / 90 Utility ATV Service Manual, Page 27Get this manual
CleaningInspecting Piston Ring Grooves 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 grooves 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
CAUTION
Improper cleaning of the ring grooves by the use of the wrong type of ring groove cleaner will result in severe damage to the piston
Measuring Piston-Ring End Gap (Installed) 1Place each piston ring in the wear portion of the cylinderUse the piston to position each ring squarely in the cylinder2Using feeler gauge, measure each piston-ring end gapAcceptable ring end gap must be within specificationsATV-1069
Measuring Piston Skirt Cylinder Clearance 1Measure the cylinder front to back in six places