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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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