I have rebuilt the carb. Adjusted the float. Adjusted the needle. Quad will now start and idle pretty good. Quad runs pretty good on top end. Low end to mid throttle or a little more the quad sputters, going downhill the quad sputters like it's trying to backfire but doesnt actually backfire that I can recall. I've cleaned and rebuilt the carb, adjusted I dont know how many times. Seems like at times, i can get it running a little better then it starts acting up again. Does anyone have any suggestions? I'm new to working much on fuel systems.