Originally Posted by Reverend12
You aren't going to smooth out a YZ490. I had one when they were new. It'll throw a grapefruit size rock a half a mile...
Well even just a little smoother on the YZ490 would be OK. It's also supposed to run better and be easier to get the jetting sorted out. But I'll find out when my parts come back. I got the jetting sorted out on my YZ465 and it runs great, throttle response is right there. But in a way, it dose kind of feel like I shortened the fuse to the TNT.