Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 240Get this manual

Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 240

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POWR CAMSHAFT AND VALVES
Valve seat cutter set First: 90 cutter Use Second: 45 cutter

Desired result To achieve Centered valve seat with the proper width
4 The valve seat is t