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If the problem is concentrated in the top end, it's probably the mains. The needles will be wide open by about 2/3 throttle.


Was the jet kit for an otherwise stock bike? Running without the stock airbox and KN filters dramatically changes fueling needs, all else constant it will run much leaner and thus need bigger jets to compensate.

Generally speaking stuttering is from a too rich condition and bogs are from too lean. Take a look at your plugs to get a hint about where to go, you might call the manufacturer of the jet kit and explain your setup and issues.
 
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