I ride a 99 yz400f that i got used a couple years ago, and with the help of this forum I've got it running and working pretty good. I like the bike and it is my first big bike since I was a just a kid. Well I went riding with my son and a couple friends yesterday, and my buddy says ride my bike a minute, I think it's running a little rich on the bottom. So I hop on his 08 yz450f, and holy shit! what a huge difference in those two bikes! It is way easier to ride, much better brakes, feels way lighter, and better power everywhere. My wife is gonna kill me!