legowt
to measure the float height for the loose float type carby you need to
1 take out the main jet from the carby
2 measure between the carb body to the float tang
3 the measurement is 12.9 to 14.9 mm
to do this measurement you can make up a gauge or set up the depth gauge on a set of calipers to the distance I set mine to the centre at about 14mm.
this detail is in the Clymer manual for 175 to 400 pe's this also gives the jets,slide, needles to run in the 34mm carby.
thanks