Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 250Get this manual
LOWR DRIVE SHAFT, FORWARD GEAR AND SHIFT ROD E
4Install: 9Ball bearing (forward gear)
Install the ball bearing with its manufacturer's marks facing the forward gearBearing installer: (Bearing inner race attachment) YB-0601690890-06634 Driver rod: YB-0607190890-06605