Spark at high tension from coil when coil current is interupted?
All parts fitted properly?
Changing parts 'ad hoc' is not the way to go. There are so many possibilities it is not worth guessing.
A reasoned diagnosis from battery to spark plug is required, and each stage must test out OK before the next stage can be checked.
Assuming you have the standard Ketteringham system, as fitted to millions of vehicles over the years, there will be a wealth of information on the net.
You should also have a wiring diagram for your machine and that may help.
A multimeter of some sort is preferable but these systems were checked out using a lamp probe, by most poeple 50 years ago or more.
They managed to service the systems with little or no high-tech aids and coped (mostly) quite easily.
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