2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 143Get this manual

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CAMSHAFT, ROCKER ARMS AND VALVES
8.Measure: Valve seat width Out of specification Reface the valve seatValve seat width: Intake: 1.21.4 mm (0.04720.0551 in) Limit: 1.6 mm (0.0630 in) Exhaust: 1.

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