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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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