1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 169Get this manual
CYLINDER AND PISTON
PISTON RING INSPECTION 1.Measure: Ring side clearance Use feeler gauge CDOut of specification Replace the piston and rings as setNOTE: Clean carbon from the piston ring grooves and rings before measuring the side clearanceSide clearance Standard Top ring 2nd ring 0.04 0.08 mm (0.002 0.003 in) 0.03 0.07 mm (0.001 0.003 in) Limit 0.13mm (0.005 in) 0.13mm (0.005 in)