On this old beast we have a issue. my 1954 235 stovebolt with a rebuilt rochester model B carburetor was rebuilt by a local guy who has been doing engine work for the past 40 years. when we got it back and i fired it up for the first time in 12 years, there is this horrible popping that is almost like backfire out of the carburetor that happens at random times. i dont know what is causing it. ive re adjusted the timing about 5 times and it still pops. does anyone know what causes this and how to fix? i have 2 possibilities, that being either still a timing issue or a valve issue.
ill check the adjustment on them eventually but id rather ask the pros first. it has only ran for a total of 3 minutes so if it is a serious problem there shouldnt be too much damage.
