I raced a 730 kfx this past weekend, and he spanked me. I would get the hole shot, but he would blow by me when I was at the top of third. I gained some respect for these things after that. I'm going back to the dunes on may 8th, and there will be a group of kfx riders out there, one is a big bore (800 something cc's) with nitrous that makes over 100hp to the wheels, I'm really looking forward to seeing it run.