One of the guys I work with built this. He says it's so fast, he's never gotten it out of third gear. It spins the tires all the time.
Standard go kart frame Harley Davidson sportster 1200 motor.
We've told him about the death trap thing. Doesn't seem to care... It has a brake, The clutch is a handle on the gear shifter. The pedals are there. just a bar hooked to a cable. the first brake rotor that he had on it he folded in half like a taco. No videos yet that you can see whats going on, just a crappy cell phone one from too far away. We'll get one soon.
Lookup "Cartvader" on Youtube and you will see a guy w/ a go cart outfitter w/ a 1300cc Hybusa moter.... and he takes it on the highway! Passing cars like they are standing still!