1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 163Get this manual

1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 163

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IpOWRt21: I
Valve seat width limit: 0.91.1 mm (0.0350.043 in)

3 Measure: Margin thickness Out of specification valveMargin thickness: IN: 0.61.0 mm (0.0240.039 in) EX: 0.71.1 mm (0.