Id love to see a 4 stroke engine kit that was designed for a BICYCLE!
49cc, 79cc, 125cc ... Really dosent matter to me , as long as it was truly designed for a bicycle frame, and affordable.
A little V-twin would have me interested!
This ^^^^^ the developer kit costs $30k...I've got my eye on a company called LiquidPiston, which is in the prototyping phase of designing a 70cc rotary engine which produces about 5.5 hp, turns 15,000 rpms, and weighs 3 lbs. It would make for one **** of a motorized bicycle.