They do. Most are not regulated, that I'm aware of. I simply suggested it so that the OP would have an idea of what to do in order to make it work for a standard engine.
Here's why it always charges, and doesn't involve a voltage regulator: It's a Generator. Run the head light all the time, and it eats up the extra voltage, so there is no danger of overvolting your electrical system.
Using a generator in place of an alternator is not an efficient method, I know. That's why I suggested that OP get ideas from looking at the design, not actually implement the use of a motorcycle's generator in his own plan.
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