Did you just the carbs through with an airline or did you remove each jet etc & clean it individually?
Check the carb tops for punctured diaphragms?
With no air filter on the carbs, open the throttle & confirm that all four needles are lifting with the slides.
If the bike refuses to fire up on a closed throttle, it sounds like the pilot circuit is blocked? If you look at the front of each bellmouth, there may be a small brass jet loacted towards the bottom of the bellmouth entrance, this is possibly related to the pilot circuit? I'll try to provide a betteranswer later when I will have a GSXR manual in front of me - carbs are the same make & very similar.
Steve
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