2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 131Get this manual

2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 131

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Power unit

S6AG5200 S69J5845

4 Measure the valve seat contact width where the blueing dye is adhered to the valve faceReface the valve seat if the valve is not seated properl