I'll give you what my experiance yesterday was and we and our bikes are very similar to yours
Buddys raptor: He weighs 160 , Has White Bros pipe, K&N and jetted properly.
Pretty good rider.
Me Banshee: weigh 210, KN, fattys, milled head, +4 timeing, lightened flywheel, 15 ft sproket. Decent rider and we both have same tires.
Now this wasn't sand we were on the road. we came out of the trail on to the road and he was ahead of me. He punched it and then I did and when I hit third gear I went by him pretty quickly then I was gone.
Then on the way back we were rolling in about second we both punched it and that was the last I saw of him.
So you should get him but I don't know how sand is though.