Hi Stevie,
I found in an old Chilton Japanese Motorcycle repair and tune-up guide the float adjustment for a Bridgestone 175. It's 20mm. or .784 in.
Note, this is not with the carburettor upside down but the carburettor turned 90 degrees from the normal position until the float hits the needle!
In most workshop manuals the carburetor is shown upside down when measuring, this is not correct because the weight of the float presses on the needle.
Greetings from the Netherlands, Ernie