I have an opportunity to trade my 08 yz450f for an 09 kx450f. I am growing on the yamie more and more but the efi on the kawie is tempting me to trade. Now i was going to get an 09 kawie originally but i wanted to see what kind of problems they had first. And I got the yamaha not because it was a second choice, but because i love the engine. So far so good. Now I need all you yz450 riders out there to convince me why I shouldnt trade!! I am not leaning either way right now. They both have there pros and cons. The yamaha has potential for greater power because i could always get a larger carb, but the I have all the FI software for the kawie already. I would just have to plug and play for adjustments. Obviously the yamaha is a great bike, but is it better than the kawie? Opinions, rants and negative comments, I'll take them all!!