Well, we haven't ridden the '06 YZ450 yet, but we've been working on it. So far, I've added my Slider Wear Plate, a new Regina ORN, Windham bend bars (Junior is 6' 2"), pulled the forks up 5mm, set the sag to 95 (it was 80), and set the jetting at 165MJ and a 45 pilot, based on info from all the '06 owners I've read. I also had the kid gin up a temporary stone shield for the front of the engine to prevent the dipstick from getting knocked off by a stray rock. He'll be building some billet dip stick knobs when school starts back up The carb is indeed a lot tougher to get into. I disconnected the TPS for some extra slack, disconnected the hot start to avoid breaking the fitting, and removed the head stays. Then it tips out and over far enough for good access to the jets. The rear triangle is lots easier to pop on and off than the '03 is, though, so don't hesitate to do that if it helps. Pull the right number plate, and the two bolts from the exhaust, and the rest slips off and on nicely. What have you settled on for your suspension settings? We ride in areas that have some really big, quad-generated whoops, and my son likes fairly loose damping so he can blitz them. What works for you, and how much did it change as the suspension wore in?