I am working on my father-in-laws B with a Zenith carb that he said sort of backfired and then started missing. I took the carb apart and cleaned everything out, put it together and had the float set too high so gas ran out of the vent on the bottom. I adjusted the float so it seals fine but it still runs way too rich. If I turn the fuel shut off just about all the way off it runs like a watch.
I have been working on engines for many years, so I think I have all the obvious stuff covered, but this is driving me nuts. I have adjust the idle jet and even shutting it off makes no difference. This carb does not have a power jet/high speed jet.
Any suggestions greatly appreciated.