1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 57Get this manual

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Maximum allowable taper: 0.08 mm (0.003 in) Maximum allowable out-of-round: 0.05 mm (0.002 in) Hone the cylinder bore using hone with fine stonesHone no more than required to remove all wear marksCyli

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