I currently own a DRZ400, and I want a lighter bike. ?i weigh 230+, and am considering a WRF250. How is the power if I do a big bore kit and up the weight of the flywheel? I want as much low end as possible. Will i get decent low end or am I going to have to rev the crap out of it all the time? Am I better living with a 20lbs penelty and going with the WRF450?