Knock could be spark knock from whats causing the backfiring. Id check to make sure there is no air leak at manifold and carb. Backfiring can be from a really lean engine, and a lean engine runs hot, which in turn "can" cause spark knock(engine contiunes to fire after intended since plug too hot). Does it smooth out some when you put choke on. Ive seen them so bad, you can put hand over intake of carb, and the engine not only still run (very bad sign) it runs better. Heh.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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