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 Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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