I found that this made it worse. I tried covering it while it was running on the stand and that almost stalled it. I'm having a problem now (after moving the the throttel needle up/clip down one notch) where it wont start and I'm thinking it's a fuel flow problem. there's a big air bubble in my fuel line and the bike wont start. I'll check it more this weekend. Could be petcock clogged, float valve stuck closed, etc, etc... I'll work thru it, get it started again and see if moving the clip helped (or wether it was a fuel flow problem to begin with) and update.