Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 222Get this manual
SHIMMING (COUNTER ROTATION MODELS) (EXCEPT FOR USA AND CANADA)
SELECTING THE PROPELLER SHAFT SHIMS
NOTE: Find the shim thickness (T4) by selecting shims until the specified measurement is obtained with the special tool6695
1Install: Shim(s) Thrust bearing Rear propeller shaft Tapered roller bearing Claw washer Ring nut 6