Rusty, Nope -- If you will check the M/Super M carbs closely you will find the the discharge tube on the SM has smaller holes than the one for the M. The jets are the same, the part numbers of the discharge tubes are different. The smaller holes allow less flow at a given setting, allowing the main jet screw to be screwed out farther. I have not seen this explanation in print and I don't know what else is different, if anything. I will stand corrected if what I have said is incorrect. However the SM I am working on how came with an M carb. I got a SM carb from Mike at Steel Wheel Ranch and that is when I discovered the difference in the two carbs and the reason why IH changed the adjustment given in the operators manual. On my Super H, when I bought it several years ago, I adjusted the carburater the old way, went up a slight incline, and it almost died. I then read the operators manual, and found the 5 turns out thing. You are right when you say that the final adjustment will be when the tractor is put to work, but the adjustment on the Super H and Super M-up will have more turns than on the non-super H and M.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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