Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 220Get this manual
SHIMMING (COUNTER ROTATION MODELS) (EXCEPT FOR USA AND CANADA)
Example: If M1 is "29.90 mm" and is "+5", then T130.6(+5)100 29.90 mm30.60.05 29.90 mm0.75 mm (3) Select the reverse gear shim(s)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
SELECTING THE FORWARD GEAR SHIMS