Carb overflow

[shortman1166]

Every time I check after I go for a ride it seems like some gas has come out of the overflow. I don't think its a lot but it seems to be every time I ride. What would cause this? The float set to high? It is factory all I have changed are the jet sizes in the carb.

[90GTVert]

Float height would be my first check. Make sure the float needle and seat don't appear to be damaged while you're there.

[oakleyscoot]

Two reasons for fuel dripping from overflow.
1. Float set too high, but it would need to be quite high to allow fuel to rise above the overflow tube in the float bowl.

2. Float needle is failing to properly seal against the seat.

       Check needle tip and seat while in the carb, a q-tip works well to clean seat, and look at the tip of the needle for anything that may prevent sealing.

[GrumpyUnk]

If it(fuel) is coming out the curved overflow tube, then it should also be coming out the air cleaner, as the air cleaner is 'downhill' from the venturi, and overflow should fill the bowl, and gurgle out the main jet past the slider needle(for one spot). That fuel should flow downhill into the intake tube and the air cleaner housing.
For fuel to come out the overflow, something must be pressuring the float bowl, or there is a vacuum being developed or ??? to make it come out there rather than the air cleaner.
The needle could be sticking in the bore that leads to the needle valve seat, or the hinge pin on the float could be binding, or the 'spring clip' that goes onto the needle and the 'tab' on the float could be mangled or cocked, leading to slight binding. It does not take a lot to make the needle valve decide it wants to leak.
You may be able to clean using compound, toothpaste, baking soda and a Q-tip type cotton swab. You can chuck the Q-tip into a drill and spin if you desire. The needle seat should be clean as a whistle, no deposits or crud. Ditto the tip of the needle itself.
In general, remember the float should be just about parallel to 'horizontal' with the carburetor inverted and the float resting on the needle. Imaginary line from inlet to outlet should be close to 'horizontal'. If the float is tilted upwards, the fuel level will be lower than desired. If the float body is tilted downward, generally the fuel level will be higher than desired.
You should not be able to blow through the fuel inlet(blowing into a piece of fuel line pushed onto the inlet barb) with the carb inverted, needle installed. The weight of the float pushing on the needle should be enough to prevent blowing through. It you can blow air through, your needle valve is leaking, the float is jammed, etc.

tom