Some causes of carburetor flooding:

Possible carburetor problems
(A) defective fuel valve
(B) dirty fuel
(C) failure to flush fuel line after disconnection
(D) defective float
(E) cracked casting
(F) improper float adjustment
(G) incorrect fuel valve orifice
(H) defective accelerator pump discharge check valve

Other possible causes
(A) fuel pump creating excessive pressure
(B) wrong gas tank cap (no joke)

There are probably others, but one (or more) of the above should catch it.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop