1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 162Get this manual
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VALVES AND VALVE SPRINGS
Reface the valve
Valve seat width: Intake: 1.01.2 mm (0.0390.047 in) Limit: 1.6 mm (0.063 in) Exhaust: 1.01.2 mm (0.0390.047 in) Limit: 1.6 mm (0.063