Yamaha F100B F100C Outboards Factory Service Manual, Page 203Get this manual
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Shimming (F100C)Backlash (F100C) Calculation formula: Forward gear shim thickness (T1)24.50F100 Example: If "M" is 24.00 mm and "F" is (+5), then T124.50(+5)100 24.00 mm0.500.05 mm0.55 mm If "M" is 24