2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 145Get this manual
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CAMSHAFT, ROCKER ARMS AND VALVES
b Installed length
12.Measure: Spring tilt Out of specification ReplaceSpring tilt limit: Inner: 2.51.6 mm (0.06 in) Outer: 2.51.6 mm (0.06 i