fuel feed issue

[Roadking]

Hey guys/gals I haven't been on here lately but I'm having an issue with my wifes 99 Gz250.
Bike sat in garage nearly a year. After charging battery and adding fresh gas to 1/2 tank, Took for a test ride. It was a little rough running until I got to local fuel station and topped off with 93 octane.
She smoothed out so I went on a 55mph back road and opened her up.
after reaching 60, for about 30 seconds she sputtered and died. I switched to PRI on petcock and before I slowed to 40 it started back up. So I slowly accelerated back to 60. Made it 2 miles and she quit again. Pulled over and shut off waited 2 mins, started right back. Made it back to the house after this repeated itself 2 more times. I figured its starving itself of fuel. I pulled the bowl off the carb and blew air (from my lungs) through the inlet hose and checked that the float wasnt shutting off too early. looked clean too. I sprayed some gumout cleaner all up inside the carb and float bowl and reinstalled. The petcock acts normal. No fuel flow the on or res but pri flows freely.
Took out for another test run and it took it longer but same symtoms. She idles great. Choke is working normal.
Any ideas whats causing the fuel starvation? Maybe high speed jet has some clogging?
Thanks in advance
RK