Well I just got my YZ400F the other day and the bike is awesome. It's a 1998 model and is pretty much stock and in great shape. When I first test rode the bike at the guys house I knew I wanted it. The motor on this bike is just great, and everything else is such a step up from the KDX. I'm still getting used to the extra weight and four stroke power delievery but so far I'm loving it. The starting issue hasn't been much of a problem so far and somehow I manged to get the bike started first kick when I went to look at the bike. But of course it took me close to 15 when I got the bike home :think I've stalled it once and just gave up for a couple minutes and it started right back up. I'm going to try and take some pics tommorow and get them posted up on here. It does seem like a very complicated bike, especially compared to my KDX, just by taking a look through the manual and at the carb I could tell it's definetly a lot different. Let me know if there's anything I should be paying attention to on the bike or if there's anything I should do to it. Is a new exahaust really worth all that money? The current stock header on the bike is a bit used and starting to corrode a little. I'll get some pics up tommorow. Thanks everyone for the great advice on the YZ400, I'm totally happy with it.