I have to admit I'm a bike whore. I ride a suzuki on the street a honda in the desert and I use the kx500 exclusively for making all others cry in their high octain fuel at the sand dunes. The head is from a YFZ450/500 big bore,big stroke,big valves,big carb,big cams and a little 130 pound kid riding it. Weez goin sand dragin.