Sorry for bringing up an old post, but I do have some information on the crf50 knockoffs.. My friend has one that I ride alot in the pits around here, and its very reliable, its been through heck and back, and its still kicking, the forks on it got bent as did the frame and the exhaust broke (in one crash) and it still runs. The only thing is, the left sidecases arent the strongest when the chain comes off, and the fork boot type things like to pop off (at least on the ones we had) but superglue fixed that. Hope this helps you.
86 Honda 200sx (needs alot of work)
82 XR200R (runs great, now the daily rider)
91 acura legend junker, selling to get a truck
2001 GSXR600 Part out, PM for info or for parts.