Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 278Get this manual

Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 278

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CAMSHAFT AND VALVES (4)Bore the valve guide using the valve guide reamerValve guide reamer: NA90890-06804
After refacing the valve seat or replacing the valve and valve guide, lap the valve seat