Gonna need a little more info Ride. first off the sprocket change won't have anything to do with it. How many miles do you have on the bike? Have you removed the epa crap? ( this will help with the pops) When you say you aren't gaining any more power after half throttle are you sayng that the bike doesn't gain speed or higher rpm's? I've got a couple more questions but I'll let you answer these first. You might check the intake manifold from when you pulled the carb an see if its loose or to tight. Being its rubber its kinda sensitive.
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