bw784e

i have rebuilt the motor, replaced the fuel pump, cleaned the carb, replaced fuel filter, changed spark plugs, now for the problem it will start right up an runs but at wide open throttle it will only run about 3 to 5 min then dies will always restart but sometimes it acts like its hydro locked for for a min or two then will restart it will run all day at half throttle is there something i am missing or anything i can try please help thank you brandon