Honda Outboards BF40A/BF50A Service Manual, Page 325Get this manual
BF40A-BF50A THROTTLE CAMIDASHPOT DIAPHRAGM
The throttle cam and dashpot diaphragm servicing can be made with the engine installed1) Disconnect the throttle rod pivot (P5-2)2) Remove the 40 mm flange bolt and mm washer3) Remove the following:throttle cam- assist spring- assist plate- throttle opener cam- opener cam return spring- 6.7 12.5 24 mm collar[1] mm WASHER 6x40