Here is the deal. Are you finding that when you adjust the main jet to the point it eliminates the smoke once the engine is up to speed or traveling down a level road you now have a stumble when you open the throttle quickly? If so it is just the curse of a tractor carburetor with NO accelerator pump, a fairly long up draft intake manifold runner and the intake manifold that has less inherent heat then say a V8 where the manifold sets right on top of the engine. It has been my finding that IN SOME CASES if you want your plugs to burn clean you have to lean the main jet down and live with a bit of stumble. It can help to set your ignition timing advanced to the point that you are starting to hear some ..pinging.. or pre-detonation when the tractor is up to full operating temps and is under a fair load like going up a steep hill in road gear, then back it off 2 or 3 degrees. Which does bring us to some other points. Does it have a thermostat in it and is the engine coming up to the proper temp? What are you doing with the tractor during the test or run period? If you are only putting around a bit or taking it down the road a half mile you are not really giving it any kind of a test. As Stevie and Jim are pointing out these tractors were designed to be worked and not necessarily make the most economical use of the fuel. One last thing, do you or have you been taught that a machine with a manual choke should be ..warmed up.. a minute or two with some amount of choke applied say a 1/4 to a third? I am used to Farmalls and unless extremely cold they need no choke to run after 15 to 20 seconds. Only if you start them and almost immediately put them in gear and try to move then yes, a quick out and back in of the choke rod will keep it going. If your tractor can stay running at a 1/4 throttle with no choke during a minute or two warm up than DO NOT USE IT.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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