Been there, done that, 4 stroke that is, ran the gas gas last year with cast smarty, carb ice won, went to 300 Xc and finished season with it, as far as having to rev the crap out of it I haven't had to. Also as far as the four strokes feeling as light as the 300, NO WAY. Everyone that has ridden the smoker and the four strokes back to back can not believe how nimble and light the 300 feels.i ride for the fun factor and the 300 makes me smile. I will admit going straight up a hill the big thumpers have more torgue but I did enough of that with my old sled. Bikes are for trees and these things shine.