If your Cub has a magneto you need not concern yourself with the ignition - it is fully independent of the rest of the electrical system.
If it however has a coil/distributor ignition it must have either a ballast resistor added to the coil primary or a "12 volt" (self-ballasted) coil installed. (As the others point out the stock 6 volt coil and breaker points will not last long on 12 volts.)
As for the generator, simply check the ammeter while the engine is running at speed. If it indicates charge (needle to the right side of center) the battery is charging. However if it is centered or to the left of center your battery is not charging - it will eventually go flat on you.
If the ammeter is inoperative, you can also check generator operation by sticking a DC voltmeter across the battery posts with the engine running. If the battery is charging it will read 14.0 volts or a bit higher.
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The fact the headlights work suggests whoever did the conversion likely already took care of the electrical issues including replacing the original bulbs with 12 volt bulbs. Otherwise the original 6 volts lamps would have quickly burned out the first time they were used on 12 volts.
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