2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 139Get this manual
Drive shaft and lower case General pipe 1:33 mm (1.30 in)28 mm (1.10 in)
Installing the drive shaft
1Install the forward gear, then the drive shaft assembly, pinion, and pinion nut, and then tighten the nut to the specified torqueForward gear outer race installer 1: YB-06085 2Install new needle bearing into the forward gear to the specified depth
S68S6410
Drive shaft holder 1: YB-06151
Pinion nut: 93 Nm (9.3 kgfm, 68.6 ftlb)