2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 215Get this manual
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Shimming (counter rotation model)Backlash (counter rotation model) Calculation formula: Forward gear shim thickness (T2)M0 Available shim thicknesses: 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and 0.50 mm M