Is the carburetor a Zenith similar to one in photos?
Is the problem with the plug in the bottom of carburetor shown in photos?
Zenith was a French carburetor used on Ford Model A and B and a wide variety of tractors. and other engines. Same basic design with variations to suit application. Model A Ford sites cover variation used on Fords.
Thread and crack repair may be possible with a product similar to
JB Weld that is more resistant to gasoline/alcohol.
