I'm guess i am not jetted properly. Because when i just had the full exhaust system on and a open lid with a k&n it had good bottom. Then i put the esr airbox eliminator kit and they told me just to run a 200 main and i think that was way to much fuel for it. Because it did not have the bottom end at all anymore and mid to top just wasn't there either. So when i put the cam in it seemed lean it out more so it wasn't running as rich. But, i still have a filling i'm running a little rich on the main and lean on the pilot. With those 3 mods does it make since just to change the main? Or should i have change the pilot and maybe even put a different needle in there? You see i might be getting the edelbrock carb soon and thats really easy to do all the jetting stuff. I wish someone who has a 450r could just ride mine and see what the problem is. Or could just tune it right.