2000-2005 Yamaha F40B Outboard Service Manual, Page 338Get this manual
SHIMMING (EXCEPT FOR USA AND CANADA)
(3) Select the reverse gear shim(s) (T2)Calculated numeral at 1100th place more than 1.00 1.10 1.20 1.30 or less then 1.10 1.20 1.30 1.32 Rounded numeral 1.0 1.1 1.2 1.3