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Just to follow up.
The charging coils on the Lifan horizontal kick-start engines are grounded at one end, and the two output wires (normally yellow and white) are from partway down the coil (yellow) and the other end (white). The rec/reg for these units is a half-wave rectifier, and an inefficient regulator, meaning it's not a good system for getting the most DC power out of that coil.
But there are pretty easy and cheap solutions if you want more DC power and are not running lights off AC. Cheapest and easiest is to "float the ground" (take the coil end that's grounded and attach it instead to the yellow wire), AND get a $10 full-wave rectifier off ebay (looks just like the half-wave ones, except it has cooling fins on the sides as well as on top; search for lifan rectifier). If you're really looking for efficiency and want all the DC power you can get out of that little coil, do the ground-floating trick and also find a Shindengen FH series rec/reg. They are kind of big, partly because they are made for three-phase stators, but they work as full-wave rec/regs just fine. They use MOSFET circuitry which is much more efficient than the stuff in the old school rec/regs. Unfortunately they're expensive, so expect to spend at least $50 on ebay. But there are BIG differences between the wattages you can get these ways. For instance, you get MORE than twice the DC power by floating the ground and using a full-wave rec/reg.
Mark
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