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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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