Well, it's been about 4 months, the new has finally worn off my 2003 WR450(about 300 miles, about 100 e-starts and no failures - dealer did service bulletin) and I have two things that I sure would like to improve on my bike. A lot of you guys are obviously pretty good at bike improvements. I could sure use some of your input here. I have made no modifications to the carburetor jetting, but I have shortened the throttle stop screw, removed the air intake silencer(actually, I don't think I removed all of the airbox restriction that most people do.), and sometimes use the GYT-R exhaust insert. 1. There is a lot of vibration, particularly in the handlebars. It's especially noticeable on dirt roads, even at low speeds. I compared the feel of smaller bikes(XR100, XR200, TTR125) and they are very smooth. Is the vibration normal for big bore fourstrokes like this? 2. When i try to run at very low RPMs just off idle, the motor is a little held back, but with a very small amount of throttle eased on, there is a quick "hit", making it difficult to find a sweet spot for "putt-ing" when I want to. It makes me jerk backward and forward(enough to be tiring, but not exaggerated enough to be comical) as the engine speed crosses the "hit" point. The higher this bike is revved, the better it runs. It breathes fire from half throttle on. I know this is a competition bike, so maybe it insists on staying above near idle rpms. Is this just how it will be? Thanks for any help.