yea its hard to beat a dirt bike on a stock or slightly modified atv juss because of the weight difference and the dirtbike usually gets better traction ive watched a stock yzf450 beat a 660 raptor that has everything u can think of done to it juss because it dirt bike gets out of the whole better while the raptor is sittin there spinnin and the weight difference helps alot to its juss had to win against a dirtbike when there is a good rider on it in a drag race on dirt

 

The RM will leave u...[img]i/expressions/face-icon-small-blush.gif[/img]

 

the RM blaster i bet flys

 

Dirtbikes have a way different power to weight ratio than atv's. I have never seen a quad come close to beating a CR500 not even modded out the *** shee's. As for the RM250 vs the 450R say bye bye 450R you will see the RM when you are on the start line but after that you see dust ive been on a piped and geared 450R and raced a stock 1987 yz250 and that bike ripped me right up like no tomorrow. heres some advice if someone asks you to race your quad and there on a bike save the embarrasment and say your quads not runnin right or someshit it looks better on you than getting WHOOPED.