Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 202Get this manual
SHIMMING (REGULAR ROTATION MODELS) (EXCEPT FOR USA AND CANADA)
(5) Calculate the pinion shim thickness (T3)Pinion shim thickness (T3)82.0P100 M3 M4 NOTE: "P" is the deviation of the lower case dimension from standardIt is stamped on the trim tab mounting surface of the lower case in 0.01-mm unitsIf the "P" mark is missing or unreadable, assume "P" value of "0", and check the backlash when the unit is assembled If the "P" mark is negative (), then add the "P" value to the measurementExample: If M3 is "50.75 mm", M4 is "30.52 mm" and is "-5", then T382.0(5)100 50.75 30.52 mm82.0 0.05 50.75 30.52 mm0.68 mm (6) Select the pinion shim(s) (T3)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