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Stan Thomas

Carburretors should not leak.

Having reviewed your appraisal of the situation, I recommend the following.

Check the needle valve is seating properly, so that the fuel supply is cut off when the float chamber reaches the correct height.

Remove the top pf the carb body and throttle/air slides complete.

Dry everything thoughly, and turn on the petrol – observing if fuel creeps out of the jet orifice. The fuel level should be about one milimetre below the top pf thejet orifice.

Sounds to me you have one of two problems – either the neddle valve is not seating allowing fuel level in the float chamber to rise beyond the pre-determined height, or the fuel level is too high even with the level correct in the float chamber.

Stan Thomas.