Help! I have a bone stock Honda NX250. It starts easy and from about 2500 rpm to redline, it pulls like a freight train. It also idles good. However, from idle to 2500 it hesitates and stumbles. If I roll the throttle slowly, it will rev OK. If I am fast on the thottle, it dies. I am guessing the slow jet sizing is wrong. Anyone else have a similar problem? If so, how did you solve it? Thanks.