Honda Outboards BF40A/BF50A Service Manual, Page 314Get this manual
BF40ABF50A
3DASHPOT DIAPHRAGM
Adjust the dash pot diaphragm after adjusting the idle speed (see base shop manual) 1) Remove the engine cover2)
THROTTLE
Remove the throttle rod from the throttle cam
THROTTLE ROD
3) Loosen the 16 mm torx bolts using commercially available torx bit (T30H)
TORX BIT T30H (Commercially available)
6x 16 mm TORX BOLT (2)