1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 99Get this manual
ASSEMBLY AND ADJUSTMENT
10Place th re erse-g ar shi in place, th install th arin usin g, alig nin th ke in th ar-case ith th at in th arin g-h usin g, and insert th ke y
11Place cla w-w ash er in place, install rin g-n ut (w ith its osse arks facin ut ard fro th arin usin g), tig hte th rin g-n ut to th sp ecifie torq e, and th cla ww ash er er th rin g-n ut to lock itRing nut wrench: YB-607590890-06509 Extension ring nut wrench: 90890-06513 Ring-nut: 90 Nm (9.0 kgf, 65 ft lb)