Honda Outboards BF40A/BF50A Service Manual, Page 134Get this manual
HONDABF3EiA 415A 4) Check to see whether the claw washer tab and the end nut groove are alignedIf not, tighten the end nut until they are aligned(Do not exceed the torque of 100 Nm (10 .0 kg-m, 72 .3 ft-Ib) this time 5) With the claw washer tab and end nut groove aligned, bend the tab to stakeNOTE Bend up the claw washer tab at one place except the "A" points[1]