2004-2005 660 Yamaha Rhino Factory Service Manual, Page 163Get this manual
CYLINDER AND PISTON REMOVING THE PISTON 1Remove: piston pin clips piston pin piston 3
NOTE: Before removing piston pin, deburr the clip groove and pin hole areaIf the piston pin groove is deburred and the piston pin is still difficult to remove, use the piston pin puller 4Piston pin puller PNYU-01304, 90890-01304 CAUTION: Do not use hammer to drive the piston pin out2Remove: piston rings NOTE: Spread the end gaps apart while at the same time lifting the piston ring over the top of the piston crown