MikeC:
You have a float not "floating" or or needle valve not seating properly.
1) Did you shake that float to see if it sloshed with some fluid inside?? In a bucket, even one with some gas inside may float, but when assembled will not rise sufficiently to seat the needle valve.
2) You indicated that you replaced the needle valve but when you rebuilt the carb, did you also replace the "seat"?? That's the part the needle goes up into?? Gotta replace both.
3) When you adjusted the tab on the float, did you do it by using a tool to just bend the tab or did you just press on the float body thinking you were bending the tab?? If you pressed on the float body, what you actually did was distort the float hinges and now the float is binding on the sides of the body of the carb bowl once you reassemble it. You'll have to fix the hinges or get yourself a new float to stop that binding.
Myron B
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