So... Decided to build some killer standup bikes. Using the venerable GSR frame, and on this first one I've got a ultra rear $2,000 Trevor Simpson 62cc modded motor, ported by chris bartolone http://www.youtube.com/watch?v=630RrSot_C8 http://www.youtube.com/watch?v=br7I9vDQJXA SPECS: TS 60 Head kit race / compression release valve TS60 2x carbon fiber reed valve TS60 throttle linkage TS Outer casing TS exhaust header Ful porting throughout motor Eton fan cover and upgraded RC coil/ rpm limiter removed. MSD plug wire w/ champion plug Custom Bartolone racing pipe with heat wrap and a carbon fiber silencer, K&N Filter, delrin intake spacer (heat shield) and one **** of a CARBERETTOR, with a 1/2" velocity stack..!! 15:1 compression dome, runs VP red 110º race gas with Maxima Castor 927 @ 25:1 ratio.. Estimated over 13-15HP http://www.youtube.com/watch?&v=WIu5Q9Ygf3o Here's the Italian Polini engine, this is a brand new 5 port, with a black race crank (impossible to get) and a bunch of crazy mods. Same exact setup that won the world championship. http://www.youtube.com/watch?v=br7I9vDQJXA Also putting it in a GSR frame. This'll do 55+mph and wheelie off the line. Should be a bit faster then my 13+hp Morini 50cc street sprinter bike. These things are seriously fun. Here's my 6+HP 30cc hard tire fully built esp ported sport http://www.youtube.com/watch?v=hKpcQQNfKsA These things are SOOO Freakin' fun!!!