If you like 50s, mini-, pocket-
or monkey bikes then check this out!
I've seen stroker motors, I've seen 4-valve heads and I've even seen a desmo head on the singles but never have I seen this! Check out the vid at the bottom, that thing sounds nuts!
While it doesn't spin like the old multi-cylinder GP bikes that were also 125ccs, the fact this thing is using XR50 cases is pretty cool!
-Enjoy
http://thekneeslider.com/archives/2008/05/30/honda-125cc-inline-4-cylinder-monkey-bike/