Yeah, thats the next one on my list to get, a 1980 Yamaha YZ50G.
This RM50, i have ridden on the tar road, had it flat out at about 90km/h.
Yes, a 50cc, 2 stroke, 5 speed with a clutch, and a wicked power band to boot!
Will smoke them 4 stroke chinese bikes any day. :D