Undo the flat head screw on the air filter side and the head side flat head screw..unscrew the top of the carb where the throttle cable goes in..remove the whole carb and take the bottom bowl off on a clean bench..
Hold the carb up when the bowl is removed and gently push the floats up and let go..you want to see if there's any resistance to stop the floats going up..
Something is stopping them rising could be a small piece of grit..or some floats are hollow plastic on Hondas and can fill with petrol so they will stay at the bottom and not rise up..