Shoot carb cleaner through the carb fuel intake tube. It usually cleans out the float nerdle and seat area. Try that before cleaning the whole thing.
mikuni vm32-33 both sides :\ 5000 feet altitude/
140 main \ 159 02 needle jet\ 6F4 needle in the middle setting\ 0.5 air jet\ pilot 25/3.0 slide
35 mpg around town riding like a asno