1997 Yamaha YFM600FWAK ATV Service Manual, Page 131Get this manual

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VALVES AND VALVE SPRINGS
8.Measure: Valve seat width Out of specification seat

Reface the valve

Valve seat width: Intake: 1.0 1.2 mm (0.039 0.047 in) Limit: 1.6 mm (0.0

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