Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 344Get this manual
DRIVE SHAFT AND FORWARD GEAR REMOVING THE BALL BEARING
Remove: Ball bearing Adjusting shim(s)
Slide hammer handle 1: YB-06096 Bearing puller 2: 90890-06535 Stopper guide plate 3: 90890-06501
A For USA and Canada Except for USA and Canada
CHECKING THE PINION
Check: Teeth Weardamage Check: Drive shaft Weardamage Check: Teeth Weardamage Replace