Is it normal for this machine to vibrate when idling? It idles just fine, but it has kind of a dampened deep vibration, not a buzz, that seems to even shake the handlebars a bit. It goes away with the slightest amount of throttle. Actually it's incredibly smooth when you accelerate, and at any speed. My 250R Quadracer is just the opposite, it doesn't vibrate at idle but buzzes your hands with the high revs when accelerating. Maybe it's just a big bore two stroke thing. Does this motor have rubber mounts?

 

That is normal for a 400