Tuning CV motorcycle carbs

["atrav" <atrav@copper.net>]

With a constant velocity carb, the Keihin motorcycle type, how do you know 
whether to raise the
needle or increase main jet size?

What's happening is that between like 95 mph and 120 mph I have quite a stumble 
at part throttle.
When I go WOT, it's fine. If I close the throttle, it'll speed up for a second. 
So, I think at
partial throttle at that speed it's running too lean.

Also, if this were ignition weakness, wouldn't it get worse at WOT?

-Aron-