2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 201Get this manual
Propeller shaft housing (counter rotation model) Ring nut 0: 108 Nm (10.8 kgfm, 78 ftlb)
7Install the forward gear B, original shim(s) C, and dog clutch using pressR
Ring nut wrench 9: YB-06578 5Install the propeller shaft assembly in the reverse direction into the lower caseNOTE: Install the dog clutch with the "F" mark facing toward the forward gear
CAUTION:
Add or remove shim(s), if necessary, when replacing the forward gear or taper roller bearing6Install the ring nut and claw washer A, and then tighten the ring nut to the specified torque