Most likely the float needle valve is stuck.
A quick fix involves tapping the float bowl with a screw driver handle (works on an Atomic 4 Zenith carb).
The main cause can be crud in your fuel supply. Check or pump out your fuel tank. Look for E10 phase separation floating under the fuel.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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