Honda Outboards BF40A/BF50A Service Manual, Page 335Get this manual
BF40A-BF50A FLOAT PIN INSTALLATION
1) Set the float onto the float tab, then set them on the carburetor body2) Install the float pin using the 2.0 mm commercially available pin driver Install the float pin by lightly tapping the pin at the knurled section side of the float pin[1} KNURLED SECTION
[2] 2.0 mm PIN DRIVER (Commercially available)
SE THERMAL VALVE INSTALLATION