So the over flow on my sons polaris 50 was dripping fuel out of the overflow. I bought a rebuild kit and also ordered an amazon carb to put on while I find time to take apart the other one.

Put the new carb on. And it’s still dripping out of the overflow on the bottom? What could it be? It was a new car.

Yes the screw is tight

 

Float is stuck or needle seat inside is not shutting off fuel flow, thus running out the overflow. New is not always better, a thorough rebuild set to specs is usually better!