I have a lawn tractor with a 10 hp Tecumseh and its running so rich because of the carburetor float valve not seating. So how should I fix this?
A disfunctional float valve will cause the carburetor to flood from fuel spilling over the top of the float bowl. The float valve acts like a toilet valve and just fills the float bowl up to the top and closes until the level drops from the fuel evaporation being pulled off while running. I don't know the exact specs, but you should be able to guesstimate and adjust by bending the float tang, or just replace the float valve.
