JS, assuming that this Cub has been converted to 12V, neg ground with a 12 coil or a dropping resistor in the coil circuit, I think the key is what the battery voltage is before the alternator is running, and after. Before should be about 12.6 - 12.8 with a fully charged battery, and about 13.4 with it running and charging. Also check the voltage across the coil with the points closed (ignition on, engine not running). It should be no more than 6.5v with a dropping resistor and 6v coil.
It's possible that the alternator internal regulator is bad and dragging the voltage down to where the spark gets weak, or the voltage is high enough across the coil that the condenser or coil is getting flakey.
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