2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 164Get this manual

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VALVES AND VALVE SPRINGS

4 Measure: margin thickness Out of specification ReplaceMargin thickness Intake 1.0 mm (0.0394 in) Limit: 0.85 mm (0.033 in) Exhaust 1.0 mm (0.0394 in) Limit: 0.8

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