True flooding, when the needle valve fails to close off the fuel and the bowl overflows, can be caused by the float level set too high, the float is partially sunk, the needle valve is bad, the seat is loose, or trash is holding the valve open.
Trash in the needle valve is the most common cause. Sometimes you can flush it out by closing the fuel valve and running the carb dry. But is the tank is trashy or flaking rust, it will be an ongoing problem.
That it will idle indicates it may be high float level, or the wrong main jet, or the main jet has fallen out or loose. Usually flooding means it will continually drip gas with the engine off, or it will load up and die at idle, but clear up and run somewhat normal when under load and up to speed.
I would open it up, take a look around. Did it get this way on it's own or was it worked on? Sometimes kits come with new jets. If the size was not compared, it may have a jet for an adjustable main, which would make it way too big. You can usually find the specs online by looking up the carb make and number.
Also make sure the choke is opening fully and the air cleaner is flowing freely. Oil bath air cleaners have a wire mesh inside that needs occasional cleaning, often overlooked. Also check for bird, rodent, insect nests.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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