2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 176Get this manual
CYLINDER AND PISTON REMOVING THE PISTON 1.Remove: Piston pin clips Piston pin Piston 3
NOTE: Put identification marks on each piston head for reference during reinstallationBefore removing each 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