;-) Guess what I have in the mail already. A derbi 70cc water cooled cylinder. I think we'll find out how well the peugeot belt drive handles twice the rpm, and three times the torque...
I learned the lesson of water cooling years ago when I was trying to figure out why motorcycle mfg's abandoned the simplicity of air cooled motors. And it's all about head cooling... Enter the oil cooled head, and then the water cooled head.
As for radical or cool, they run six and seven port designs on r/c car motors. Which pull the same horsepower a stock moped does out of a mere 3.5cc. And are all air cooled. ;-)
I'm not really looking for anything "radical or cool" yet. I'm just trying to get a picture of what is out there. And what people seem to be doing to their motors. Getting the cylinders down in the record, can't hurt.
Don't stop posting port maps, the more the better!