Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 212Get this manual
SHIMMING (COUNTER ROTATION MODELS) (FOR USA AND CANADA)
(2) Install the pinion height gauge, drive shaft, thrust bearing 1, and shim(s) 2Pinion height gauge YB-06441 NOTE: If the original shim(s) is unavailable, start with 0.50-mm shim(3) Install the pinion and pinion nutPinion nut 145 Nm (14.5 kgf, 105 ft lb)