Hard to find someone willing to loan you a good carb to prove a theory. And check the base gasket. My thermoquad’s phenolic spacer was cracked, caused a backfire and burned up a perfect running carb. Burned the plastic bowl while i was driving.
the spacer and gasket are good, I just had the carb off to re-do the transfer slot adjustment.
the carburetor is already a remanufactured one that was put on in 2008 that I rebuilt because It had a bunch of oxidation all inside it.
the thing is just tired. I'm thinking of getting this thing at my local discount store.