Been using a tire generator to charge my battery via a scooter rectifier, but I just fried my 3rd one. I thought a few times about buying the 12v generator coil from wonderful creations on ebay, but it's $45 and I can't afford it. Also it's designed for a 2 stroke and I have a 4 stroke, so I decided to do some digging and found this: http://www.ebay.com/itm/Honda-GX160-...6d02f8&vxp=mtr
it's for a Honda gx, but I'm sure there is a way to make it fit my 98cc flathead. It's 3 amps, so it should give plenty of power for my electrical system, my headlight draws less than half an amp, my tail light about the same, my brake light draws 2.25 amps, so even if all 3 ran at the same time, it's still 3 amps or less. My battery is a 1.2ah, so it should charge fine. Heck, with a genny coil I probably don't even really need a battery. But I'm gonna keep it anyway.