1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 108Get this manual
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ASSEMBLY AND ADJUSTMENT
Forward gear 1 Install dial-g set to th arcase2 Install acklash in dicator-ro th driv e-sh aft, and ake th dial-g ste co ntact th ark th in dicatorro dDial gauge: YU-3097