On the subject of charging systems. i just fitted this reg/rec unit to my little Soviet 125. This one is off a Yamaha R1, picked it up for £25 off ebay. These are one of the best ones out there just now, they all look the same, some have one grey and one black socket. They use them on a lot of different bikes and also quads and skidoos, worth a mooch about on ebay to see if you can pick up a bargain (I'd suggest searching for used reg/recs, arranged by cheapest first and scroll down until you see one that looks like that). Beware Chinese copies, go for a used OEM one.
You can also buy a set of the correct (Chinese copy) connector blocks to hook them in for about a tenner on Amazon. I've just got it temporarily rigged up at the moment but I'll fit the connectors once it's all up and running. It's designed to take three phases but they run quite happily on two.