2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 140Get this manual
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CAMSHAFT, ROCKER ARMS AND VALVES 2.Remove: Valve cotters
ROCKER ARM AND CAMSHAFT INSPECTION 1.Inspect: Camshaft bushings Damagewear Replace2.Inspect: Camshaft lobes Valve adjusters Blue d