http://www.ebay.com/itm/322111682279?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT This generator is what I'm thinking of using to charge a 12v 4.5ah battery running a lot of thing (24W headlight, turn signals, and other lights. Thankfully I can save the battery juice for when it's dark) So, I have 3 places I could put it. Make a belt from the 79cc shaft to the motor. Make a belt from the jackshaft to the motor (there's a 3x speed reduction here compared to the above) Friction drive on the wheel. I'll use a diode and a regulator for the generator. Which sounds best?