As you say 3 turns out on the main jet is too lean. Open it to 3.5 or 4 turns. Max power is 5 turns out, it can be turned in for better fuel economy. At 5 turns the tip of the needle is outside the seat. There is no "sweet spot" on the Super H/M carbs as there is with the regular H/M. The idle speed is set so that it runs smoothly. The idle mixture is turned in or out until smooth.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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