When setting float drop, I have always set it such that the float cannot hit the floor of the bowl. When modern fuel evaporates, it leaves a gooey substance that resembles glue. If the carb is empty, then the float could stick to the bottom of the bowl. Resetting the drop may solve your issue.

The other Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
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