Not likely valves. You're either losing fuel or have an electric problem, IMO. Unplug the regulator. Does it still die after 5 minutes? Try loosening or removing the fuel cap...
When it dies, how long till it starts and runs again? What must you do to get it running after it dies?
'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo