2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 167Get this manual

2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 167

VALVES AND VALVE SPRINGS

12.Measure: valve spring tilt Out of specification ReplaceValve spring tilt limit Intake 2.51.61 mm (0.063 in) Exhaust 2.51.65 mm (0.065 in)

EAS00242

CHECKING THE VALVE LIFTERS The following procedure applies to all of the valve lifters1Check: valve lifter Damagescratches Replace the valve lifters and cylinder head

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