2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 147Get this manual
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CAMSHAFT, ROCKER ARMS AND VALVES
CAMSHAFT AND ROCKER ARM INSTALLATION 1.Apply: Engine oil (onto the rocker arm shafts) 2.Install: Rocker arms Rocker arm shafts (intake and exhaust) NOTE: Use sli