2006 Honda-nothing other than some new valve seats on the 250, and some updates on the 450r. Suzuki-the first fuel injected race quad (with the RMz 450 engine!) Yamaha-all aluminum frame, engine change KTM-the complete new/re-worked XC line. Husqvarna-250, 450, 510's now street legal off-road bikes! Kawasaki-all new 450. Husaberg-new 'force' models. lots of changes actually. Will Honda even make dirt bikes 5 years from now?