300/440/550 92 550 SX runs great under half throttle

Hey guys, picked up a 92. Rebuilt the carb, replaced all the fuel lines & fresh plugs. After getting the fuel pumped through the lines it fired up and idled no problem, nice and consistent. Take it to half throttle & hold it their it cuts in and out, sounds like you are actually blipping the throttle. Hammer it down past half, it bogs & nearly dies. High & low speed screws are set to spec. The only thing I bypassed was testing the pop off pressure, gauge is at my buddies house, didn't want to commute. Would a out of wack pop off reading result in high speed only issues or do I need to look at something else?
 
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