2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 144Get this manual

2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 144

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CAMSHAFT, ROCKER ARMS AND VALVES 9.Lap: Valve face Valve seat
Do not let the compound enter the gap between the valve stem and the guide Apply

molybdenum disulfide oil to the valve