I currently have a YZ250 2T. I love it. However, everybody talks up and down how nice the WR450F is. I'm curious. ONE of the things I really like about my YZ250 are the power wheelies. I now have 14/52 gearing and a rear Dunlop D756 which makes it stand skyward upon blipping the throttle where it comes into the mid-range surge in the powerband. I love this. I weigh 250 pounds. I only trail ride. If I had a WR450F, can I expect the same given there's no "powerband"? If I ever switch, I'd hate to loose this. My XR650R fully uncorked wouldn't do this. Will the WR? Also, any years of the big bore WR to stay away from? I am cheap and won't buy a new one.