If fuel is overflowing the float bowl the needle valve is leaking. This may be caused by the float (GSU200) being misadjusted, stuck or leaking OR the needle (CA90) may be fouled with a bit of grit or worn and not sealing.
This latest design float is molded plastic with a fixed sleeve for the pivot pin, nothing to adjust or come loose. Does not come with pin.
As long as you have the carb apart, you should also consider replacing the float gasket at the same time (see part # 2535).
Not for HIF