1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 167Get this manual
CYLINDER AND PISTON
PISTON REMOVAL 1.Remove: Piston pin clips CD Piston pin Piston NOTE:
Put identification marks on each piston head for reference during reinstallation Before 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 Piston pin puller:
PINYU-01304, 90890-01304