Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 312Get this manual
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DRIVE SHAFT, FORWARD GEAR, SHIFT ROD AND OIL SEAL HOUSING (F15AF9.9C) E
Pinion and forward gear inspection 1 Inspect: Teeth Dog clutch Weardamage ReplaceDrive shaft inspection 1 Inspect: Bearing