1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 267Get this manual
Measuring steps: Set the shift shaft in the forward position Position the bearing housing puller so it pushes against the propeller shaft
Bearing housing puller CD: YB-0623490890-06503 Universal pullerYB-06117 Stopper guide plate90890-06501 Center bolt90890-06504 Center bolt: Nm (0.5 kg, 3.6 ft Ib)
Attach the backlash indicator onto the drive shaft (16 mm diameter)