
I am against using epoxy on carburetors. There may well be some exotic epoxy out there somewhere that works on carburetors, but I have yet to hear about it, and the usual JB Weld is not it. Here is a recent JB Weld find on a job.

My experience is that JB Weld and at least one other kind of epoxy has its resin based leached out by gasoline, turning the epoxy into dust. As for JB Weld specifically, it is easily dissolved with any decent carburetor cleaner. That does not bode well for longtem use.