Well today I had a minor breakdown and took a spin on my buddy Loopout's new CR450F....this is not a flame on either bike, as both are GREAT bikes that any rider could win on. I finally rode the 450 hard, and noticed one very apparent trait. This bike is easy to get used to, I was jumping the doubles and hammering the same as on my 426 after only 2 laps. Brakes? Strong. Period. Clutch? Wonderful, less grabby than the Yamaha. Steering? Good for me, since I am heavier, I can make the front end drop down and turn. Suspension? With stock springs in the front, it was close, a little soft for me, but very ridable. Loop added a 5.6 spring to the rear, and it too worked fine, a little soft but raceable. Motor? VERY smooth and deceiving, it pulls from lower than the Yamaha, but lacks the midrange hit. Probably would work a bit better on a slick track, I prefer the 426 hit on a tacky track. Jumping? Neutral in the air and responds well to rider input, like if you get sideways on takeoff, maybe the weight has something to do with this. To sum it up, rider preference will definitely be the difference, as both bike can wail a track! So all the hoopla and bull**** flaing going on between camps needs to stop Both bikes are fine race machines, and as we all know, competition is ALWWAYS good for us, the buyer. I for one, am looking forward to a YZ450F that weighs about 235lbs! WHEEEE!!!!!