Is the choke closing completely? Some choke plates have a spring loaded vent door, be sure that is in place and working, if equipped. The carb may have some partially blocked passages, common with ethanol gas and infrequent use.
How is the compression? low compression will cause hard starting, possibly run the valve setting just to be sure they are right.
Is this still 6 volt? If so, everything has to be right for it to start. It needs a healthy battery, size 0 or 00 battery cables (not auto supply cables), a fresh starter with good bushings, good grounds.
Assuming this is battery ignition, check the voltage at the coil with the points closed. It should be near battery voltage. If low, could be a failing ignition switch, a high resistance connection (loose, corroded). The coil you replaced, are you sure it is the correct coil? Is there a part number on the coil itself? Often they are reboxed and get sold under the wrong part number. A good spark will jump 1/4 inch at the plug end of each wire to ground while cranking.
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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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