TxGoat wrote:
If the carburetor overflows or leaks internally, something is wrong. It takes very little foreign matter to cause carburetor trouble. Screens and filters help, but I have often found debris in carburetors that have both screens and filters in place. A new installation should have NO debris in the carburetor or filters or screens. Sometimes fuel leaks around the needle's seat where it it screwed into the air horn or bowl. That's worth a careful check even if it is tight. Once in a while, a new needle/seat will fail to seal properly. Even a very tiny defect can allow poor seating.