Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 204Get this manual
SHIMMING (REGULAR ROTATION MODELS) (EXCEPT FOR USA AND CANADA)
Example: If M1 is "29.10 mm" and is "+5", then T129.5(+5)100 29.10 mm29.50.05 29.10 mm0.45 mm
(3) Select the forward gear shim(s) (T1)Calculated numeral at 1100th place More than 0.00 0.02 0.05 0.08 or less 0.02 0.05 0.08 0.10 Rounded numeral 0.00 0.02 0.05 0.08
Available shim thickness 0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and 0.50 mm