2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 216Get this manual
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Lower unit
Forward gear backlash: 0.350.70 mm (0.0140.028 in) 7 Add or remove shim(s) if out of specificationForward gear backlash Less than 0.35 mm (0.014 in) More than 0.70 mm (0.028 in) M: Me