2010 Arctic Cat Prowler XT/XTX/XTZ ATV Service Manual, Page 44Get this manual
2The ring with the orientation mark (MTOP or TOP) should be installed in the second (middle) groove and the ring with the orientation mark (M or O) should be installed in the first (top) groove ATV-1069
Measuring Piston Skirt Cylinder Clearance 1Measure the cylinder front to back in six placesATV-1024A
ATV-1024B
2Measure the corresponding piston diameter at point 15 mm 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 illustration