There was a question about the air bleed the sits on the top of the float bowl. That is the round brass plug with a small hole in the center. This is located above the main circuit delivery passage and the plug should be domed with a small hole in the middle. These are not removable and if damaged just make sure the hole is there and if closed try to open it up with a piece of wire. That is what really matters.

When plugged the engine won't idle and if missing, or the hole is too big, then the engine may not gain speed because of too much air going to the main circuit.