OK, I've had it about a month, and have logged a couple hundred miles, and I'm still way faster on my old 426. There is a slight HP difference, but most of it is suspension, heighth and ergo's. Maybe someone here can help. The new bike is stiffer, alot stiffer and doesn't sag near as much. With the old bike I feel like it's much easier to scoot the back end around with my butt. With the 450 I keep feeling like it's so far to the ground or that I'm going to highside it. The position of the bars has a little effect, because I also feel like I'm going to go over the front more. New bars are on their way. Is this the effect of not enough race sag in the rear, or too stiff of springs? Does the extra up high weight of the starter & battery really make that much of a difference? Thoughts, ideas?