1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 103Get this manual
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ASSEMBLY AND ADJUSTMENT
Reverse gear shim 1 Fin re erse ar shi thickn ess (T2) selectin shi ntil th sp ecifie asure nt (M) ith th sp ecial to ol is btain dSpecified measurement (M)1.00 mm