I think my point is a lot of people don't realize that the M and SM carbs are different, that includes the CaseIH dealer. So I suspect that the parts used in yours were for an M. Not knowing the difference, I cleaned and put the correct kit in my SH, but I did not touch the main jet needle and jet. I adjusted it the way I always adjusted an H. Worked fine until I started up a slight incline with no load -- it wasn't getting enough fuel -- that is when I read the operators manual and found the 5 turns out thing. The SM and SH carbs are also different, but I don't think a correct SM carb will pull anything with the needle 2.5 turns out. The SM I have is undergoing restoration. It came with an M carb. I have a used SM carb for it that has been cleaned and rebuilt, I don't know what the main jet is. If I ever finish the thing I will do some experimenting and adjust it as is correct for an H and M. If it is ok, I will try to find a jet and screw for a SM. As you say 5 turns out with a M main jet is way too rich.
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