I have a piped and jetted 2003 model VTR. When it was jetted 6 months ago, it really ran great, but it has slowly began running richer and richer. My mechanic (widely known for knowledge in fuel and jetting) dynoed it and the air/fuel was off the chart. He says that it may be a problem with the tubes the needles go up and down in (they have a name...I've forgotton it). He said he saw this on a VTR once before and it's not a fixable part. It was abnormal wear, causing more fuel to flow.

Has anyone ever heard of this problem, experienced it with their bike? I can't confirm this is the probem yet, but I'll sell that bike before I buy two new carbs.