1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 109Get this manual
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ASSEMBLY AND ADJUSTMENT
5 Slo ly turn th driv e-sh aft in and ut, and re th dial-g th sh aft sto ps in ach directio n6 If th asure nt is in th ra 0.20 to 0.50it ill ecessary to or re shi s7 If t