After two years of problems with my 07 YZ450, I have decided to sell it and go back to Honda. I picked up a 2006 CRF450 last night with only 35 hours on it. I cannot believe I had a complete transmission failure with only 20 hours of easy riding. I have done nothing but maintain this bike and have had nothing but problems. I know Yamaha makes a good product, my dad and brother have had great luck. I just believe that I purchased a lemon and after Yamaha refused to help me out, I have decided to go back to Honda. I want to thank everyone that has helped me in the past on this forum.