All fuel must go through the main jet on a m carburetor. If it is working and put together the way it is supposed to be you can kill the engine at all speeds, low idle , high idle or any where in between. Some seem to think that the fuel for low idle comes from a different source. It has it's own jet but still that jet is supplied from main jet. What I am saying is a ton of these carburetors the main adjusting screw does not contact the main jet. As a preliminary adjustment I warm engine, run at high idle and screw it in until it starts to stall, or miss, or slow down or just change tunes. Then back it out a half turn or so and see how it performs and go from there. If it has an oversized main jet or someone has been in there with a drill things will be different and you may even get a bunch of black smoke when you turn it out that extra half turn or not be able to kill it when you screw it in. Best way to see if it will kill is with it apart and screw it in while watching the needle enter the main jet and then blow air through the nozzle.
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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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