Trying to figure out where your throttle is while dodging traffic can get a little hectic, so try using this simple tool next time you've got jetting issues. Wrap a piece of masking tape around the throttle housing. On the tape, mark the closed position, wide open throttle, and the points in between, where the throttle is 1/4 open, 1/2 and so on. With the throttle closed (that is, released and at rest), stick a colored pushpin in the grip, adjacent to the Closed mark. Now, using your indexed markings, note the point on the throttle where the problem occurs. This will let you (or at least the tech) determine which carburetor circuit is primary when the problem occurs.