Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 387Get this manual
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2 Drill the pilot holes using mm (0.10.2 in) drill3 Finish drilling the holes using 10.2 mm (0.4 in) drill correctly- NOTE: Drill at right angles to the transom boardELF-LOCKING NUT (4) 10 mm PLAIN WA