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Are you getting voltage to the starter, but it is not turning the engine?
If so how was this tested? and does the engine turn manually?
You do not have points on this engine
You have me very confused.
Can I assume that the starter works sometimes? And when it works the engine starts?
If there were no volts to the starter then it would never turn.
To test the starter you need to have the key in the start position, in Run there is no voltage to the starter
If it is starting (tuning over) sometimes and not at others then you either have a loose connection somewhere or a bad spot on your starter, or a bad/dirty connection.
If I understand you correctly there is no voltage to the starter right now.
Please check the small lead on the starter solenoid with the key in the start position, you should be getting 12 volts. If not I would suspect the ignition switch or the fuse between the ignition switch and solenoid.
You should also check the seat safety switch and the wiring that is coming from it and leading back to the engine