Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 167Get this manual

Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 167

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4) Remove and inspect the valve seat faceThe valve seat contact should be within the specified width and even all around the circumferenceStandard 0.91.1 rnm (0.0350.043 in) Service limit 2.0 mm (0.08