I actually saw a Kawasaki Triple on a shifter kart, and not too long ago. Didn't get to see it run, but I'll bet it was impressive. The owner of the kart had the Kawasaki gauge cluster mounted on his steering column... I could see that tach with the redline wayyyy over there to the right. I wanted a shifter kart *bad* for a month or so after spotting that triple-powered example, but even a used and abused kart chassis costs $$$ - it's cheaper to build a Toyota MR2 for SCCA SOLO competition. Now, if I could find a set of shifter kart chassis plans, I'd drag out the MIG welder and tube bender. All I've been able to find are basic "yard kart" plans. But yeah, it *was* cool!