flat spot in throttle

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BigShooter

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The Warrior I just aquired has a 3Brothers full exhaust. The guy I got it from received it in a trade already equiped this way, and really knew little about the bike, so it is unknown to me whether or not any jetting changes were done.
My problem is that the engine hits a "flat" spot when you apply the throttle quickly or pop the clutch when the engine is revved. It will pass through it after a moments hesitation. Is there any tell-tale signs that I can check to see if any work was done or the carb, i.e., any plug that has to be removed to swap jets that may be missing, etc.. Or, do I need to get in to it to see? Any other fixes for this, such as raising the slide needle up a notch, etc.., and what are the factory jet sizes?
 

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