Is that the "standard" motor(that is the name of it ) with overhead valves? After checking all of the advice here you will probably find that it is problems with the valves . I have two of these tractors and apparently they have very weak valve springs . If the clearances are good and you still have a miss then it is that the exost valve is getting sucked open on the intake stroke . What I did on mine just to get it running was I shimmed the valve with bushings/washers that fit between the head and the valve spring . There is a procedure for doing this -- please ask before attempting to do this . I am not sure why they have such weak springs --- like did they loose ther tension over the years or have the valves worn into the head so far that they lost there tension . The real proper fix here though would be to remove the head and have the valves + seats re done and the springs either replaced or have them shimmed to speck . Another symptom of weak valve springs is that when it is idling it is very irregular beat to it . Once the throttle opens up and it starts to work it will smooth out.
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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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