oh really gary? nothing would be better? not even a CR250 powered quad? just messin around. i personally don't care which engine is put in the next quad but think of this: what engine has the most potential? a 450 that is already very high preformance so that there would be a lot less you could do to add horsepower and tourqe, or a 650 that is not the most high preformance thing on 2 wheels? would it be heavier? yeah it would, but you could have a lot more engine to get that weight goin. i dunno, like i said it really doesn't matter to me.