i have an 03 crf450r and have valve/spring issues, as well as radiator overheating etc... the bike's great to ride, but it's breaking my heart and wallet. my wife actually told me to sell it and get a 2006 yz450f. she knows nothing about them except that chad reed's really hot...so i should get one. i've read up and understand the differences (there are alot) but can't test ride one and want feedback before i go any further. i'm 5'6" and 160 lbs, 250 beginner class rider.