The ignition switch serves two basic purposes, which are independent of each other:
1. Provide power to lights and accessories from the battery
2. Kill the engine by grounding the coil
The magneto/generator/alternator serves two purposes:
1. Provide a power source to the battery (charging while running) and the accessories (if your battery is dead or removed)
2. Provide power to the engine and related electronics to allow the engine to run, independent of the battery/accessory circuit
It sounds like your "engine kill by grounding the coil" wiring is bad, either inside or outside the ignition barrel. The fact that you can't turn on the lights with the ignition "off" and the engine running means that everything else is working as it should. Either look for a broken wire inside the ignition barrel, or look for a broken wire between the ignition switch and the coil (black with a white trace?). This bad ground switch shouldn't run down the battery, as it's a different circuit altogether.
Good luck!
__________________
Phil
(New bike pending...)
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