An amalgamation of parts from Yamahas, Kawasakis, Hondas, a 1940s stovetop, a Norton bolt, Hurst shifter, and who knows what else.. '49cc' block (bored to ~70cc), 3 speed semi-auto suicide shift tranny. So. Much. Fun.
Mine and my friend's bike. His has the same motor, but with a 4 speed...