Honda Outboards BF40A/BF50A Service Manual, Page 365Get this manual
BF40A-BF50A SHIFT UNIT DISASSEMBLY
1) Remove the two screws and remove the lock plate2 Remove the two screws and remove the spring guide, spring, shift arm pin and roller[4] LOCK PLATE
3) Remove the shift gear and bushing from the shift plate
[5] SPRING GUIDE
SHIFT ARM PIN
SHIFT GEAR
BUSHING