1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 100Get this manual
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1 Apply grease Lubricating gear oil Add Yamaha gear case IlJbe, PIN LUBGEARL-ll-00 through the oil drain plug hole until the oil flows out of the oil level plug holeOil capacity 185 cm (cc) 6.25 US oz