Honda Outboards BF40A/BF50A Service Manual, Page 315Get this manual
BF40A-BF50A 6) Move the diaphragm up or down slowly until the clearance between the throttle cam roller and throttle opener cam is 0.20.8 mm (0.0080.031 in)While holding the clearance, tighten the 16 mm torx bolts to the specified torque[2] 16 mm
TORX BOLT (2)
TORQUE: Nem (0.9 kgfem, 6.5 Ibfeft)
7) Connect the vacuum tube to the dashpot check valve and attach the throttle rod to the throttle cam
4THROTTLE LINKAGE ADJUSTMENT
Throttle Rod Length Adjustment
1) Remove the lock pin and washer, and disconnect the throttle cable from the throttle arm
[2] THROTTLE CABLE
2) Move the throttle arm to the fully open position and be sure that the throttle arm contacts the fully open stopper3) Check that the throttle cam is also at the fully open position and that there is clearance of mm (0.04 in) or less between the carburetor throttle lever and stopper on the No.3 carburetor