Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 170Get this manual

Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 170

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VALVE GUIDE REAMING For best results, be sure the cylinder head is at room temperature before reaming the valve guides1) Coat the reamer and valve guide with cutting oil
1 IN, 27.5 mm07780-00102