2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 166Get this manual

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VALVES AND VALVE SPRINGS
10.Measure: valve spring free length Out of specification ReplaceValve spring free length Intake 37.03 mm (1.46 in) Limit: 35.17 mm (1.38 in) Exhaust 37.68 mm (1.48 in)

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