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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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