There is a wankle rotary engine for Karts out about 2 years now...makes 48hp and weighs about 37lbs..looks to be just a bit bigger than a decent sized chain saw motor. I went to the track at Ocala FL, where they were testing one and it was as fast as a 125 shifter cart oe faster (very fast)...they make a turbo kit for the motor that ups the power to 100hp.
http://www.youtube.com/watch?v=tKayagHUCw8
http://www.youtube.com/watch?v=tKayagHUCw8
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