Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 144Get this manual
HONDA BFSOA85A
PINION GEAR SHIM SELECTION
1) Clean and lightly oil all items shown in the illustrationInstall the 25 47 15 mm bearing (inner race) on the vertical shaft (P12-12)Place the bearing outer race over the bearing inner raceTOOL: Vertical shaft gauge 2) Position the gauge end of the special tool over the vertical shaft and slide the knurled cap over the vertical shaft as shown
[I] SPECIAL 10
BEARING
151 VERTICAL SHAFT GAUGE 07PPJ -ZV70100