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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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