OK, you need to inspect the needle that was attached to the float, make sure it is smooth on the tip. If not, you will need to replace the needle and seat. If it is smooth, then you can soak the whole carb with the bowl off in a can of carb cleaner (I use B12) you can use Seafoam or whatever you have around. Soak it over night, or until you can blow air through the inlet from the fuel tank.
I believe that the needle seat (inside the carb) is held in by the O-Ring that is on it. It just kind of snapps into the carb body. You should be able to pull it out with a pick and a little persistence. It's been a while since I replaced one. Hope this helps.