I know this site is specefically for 4-strokes so at the risk of getting a few biased opinions... What are the major differences between a YZ250 and a YZ450F. I'm most likely going to be purchasing a 2004 YZ450F very soon but I want to make sure I'm getting a bike thats right for me. Let me explain how I will be using this bike. Basically I'll be riding mostly for fun but I hope to get back into MX racing eventually. I'm more of a MX rider than a trail rider. Will a 450 satisfy my big air needs? I hear the 450s can be heavier and not as fun to ride? But I like the power and it seems the 450s are becoming the more popular choice these days. So I guess my question is, with the above information, which bike would be best for me?