Ebay Add-on generator to magneto?

This is simple.
A typical 66cc 2-stroke puts out ~2.75 HP which is 2,050 Watts, both are convertible measurements for Power Generated.

Most AC/DC conversion systems for things like this run in the 30-35% power loss range.
I suggest you let your ride have all the power for moving you and use LI batteries for light.

I could see a tire generator stealing 35% of pedal power, but not engine power. Having personally used a friction generator for quite some time now, my top speed was the same with or without the generator. The engine makes enough power to overcome the resistance of the generator. And two strokes produce maybe 2 horses at best unmodified. My last engine was 2.5hp, the engine I'm installing in my current bike, a 79cc predators, is 3hp stock, should be 4 with aftermarket carb and exhaust. But even my 2.5hp engine did fine with a generator.
 
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