Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 162Get this manual

Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 162

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ROCKER ARM AND VALVES
Valve seat cutting guidelines

1 The valve seat is centred on the valve face, but is too wide
Valve seat cutter set First: Use cutter lightly Second: 60 c

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