The carburetor needs rebuilding including a new float, needle and seat, assuming it has a carburetor.
Most likely, Your float is stuck in the carburetor. If it is stuck open gas will continue to flow into the carburetor bowl, then it will flow into the crank case and cause your oil level to rise. You need to take off your carburetor and adjust the float.
The carburetor will have to be taken apart to install a new fuel float. After the top is off, the float sits in the bowl resting on a rod. Pick it straight up, remove the needle and install it on the new float. Put the carburetor back together with new gaskets.
It is in the float chamber of the carburetor.
Could be,Foreign material (dirt, rust, etc) caught in the needle and seat,Bad float,Float is out of adjustment,
The float in your carburetor might be stuck, or your fuel pump (or line ) might have a piece of trash in it.
The float is located inside the carburetor.
Someone must have converted that vehicle from fuel injection back to a carburetor. Carburetors were phased out during the 1980's. If in fact the vehicle does have a carburetor you can purchase a rebuild kit for that carb. The carb has a part number stamped on it so a good auto parts store can use that number and get you the correct rebuild kit. The kit comes with instructions. Recommend purchasing a new fuel filter and float along with that kit.
The float on a 1993 Bayou is tricky to adjust. You first have to remove the carburetor from the quad, Remove the four phillips screws that hold the float bowl cover on, take a small screwdriver and bend the float upwards or downward depending on whether you want more or less fuel.
Have you checked to see if the float has a hole in it allowing fuel to weight it down? Possibly the needle valve is sticking and not the float. Could also be the float needs adjusting. You need to open the carburetor up and see what is going on.
your float is set too high. get someone that knows what their doing to adjust it properly.
Almost All engines with a carburetor have a float valve. The exception is a carburetor Built by Tillotson, horrible things but they worked upside down.