[johnnyrod]

First, you don't without taknig the carbs off and opening them up. Surging on part throttle, or it feeling like it's speeding up as you strat to close the throttle are symptoms of leanness, but to get it sorted you need dyno set-up. Needle shimming can only fix the midrange, the top end will still be lean, you need to upjet, but there's not simple answer without a dyno. You don't necessarily need a DJ kit, it's just a set of jets, needlse etc, the dyno operator might be able to do it just with different main jets.

PS there will be people on svrider.com that will prbably suggest massive main jets, I don't know why, that's just the way it is!