Are you sure there clean? did you dissasemble yourself?
I had similar issue and i
1. removed carbs
2. drained float bowls
3. removed main jets
I soaked main jets in carb cleaner, then blew all passageways with carb spray, then sprayed carb spray through all passageways in the carbs, i checked all rubber diaphragms for cracks especially the float bowl ones, my main problem was old varnished , gel like fuel traces which had built up from bike being idle over winter.
Once i completed this i reassembled and the bike idled steady and also revved cleanly to 15k revs, you might also want to check your fuel filter as it can effect flow rates if clogged with old varnished fuel
SOURCE: i have a zxr400 with a flatspot between 4@6
Bent needles can cause horrible throttle response. Start by installing a new needle that way you know its not the problem. If your carbs have rubber diaphrams make sure they arent ripped.
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