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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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