My bike has run very rich since I picked it up this summer, it won't idle at all, despit cranking the screw in all the way. I didn't have time to mess with it, and tried my local dealer. A week later, I'm told by the mechanic that he tried everything, new needle and seat, smaller pilot jet, different float settings. Still rich, but now I have a mid range bog to boot! Extremely pissed by this. The tech thought maybe some nutball drilled out a passage or something, but I could only guess. Am I better off getting a used carb for this thing, or keep screwing around with this one?