I was out at Nellis dunes last weekend riding with my similar weight friend on his 2003 CRF450R with a Wiseco piston. We rode around for a while and than I took him to a little drag hill (200 feet). I wanted to line up for kicks. We hit the hill and I pulled him easily, both with knobbies. We raced a few more times and I let off purposely at the bottom of the hill to make sure there wouldn't be any excuses about hook-up, but I still pulled him easily. He stated that at Dumont it would be different and that once he hit 3rd gear no quads could stay close to him when he was running a knobby and quads had paddles. I talked to my friends at church who ride quads and bikes and they said they would destroy me in a race with a 450 motorcycle, they said my quad wouldn't even be close. I told them they were there at the race so they would know (these are the same guys who have yfz450's which I beat everytime we line-up with only a cam and a worn out Duncan fat boy pipe) LOL. I raced a paddled CRF450X before my 05 quad had porting and a 11.5:1 piston and I beat him every time at the large hill at Armargosa. The guy with the CRF450R rides the dunes a lot and is a good rider, but I wonder how it will be when we line up at Dumont?