SM and SMTA the same for the same fuel type. Metering on a original M carburetor was different. Hard to say what a M has in it now though. IH made 3 or 4 different parts to change the metering plus aftermarket made some for M and SM. Biggest difference in a M and SM is the choke levers are on opposite sides of the bowl. Originally a M gas and SM gas metering nozzle had different size in part of the three holes and the tip was a different size. Lots of rebuild kits that include the metering nozzle can very on the sizes if you check all. Main seat size, air bleed size and idle jet sizes could all be different between some carburetors other than the discharge nozzle.
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Today's Featured Article - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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