Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 198Get this manual
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SHIMMING (REGULAR ROTATION MODELS) (FOR USA AND CANADA)
(2) Install the shimming gauge, bearingand shim(s) 1 Shimming gauge YB-06439 NOTE: If the original shim(s) is unavailable, start with 0.50