Gy6 won't stay running

[Picyle]

Having scooter problems. 2008 VIP future champion with gy6 50cc. 1300km. Replaced carb, adjusted float needle to all settings and tuned air/fuel ratio on all settings. Changed oil and gear oil, spark plug, fixed vacuum leak and checked for others, cleaned air filter and checked for any blockages, checked intake gasket for leaks, fuel filter appears to be new and clean, only run 90 or higher octane. It drives down the road fine but when I stop for any extended period of time it dies. Also at idle if I quickly rev it half way and let go it will bog and die. Any suggestions?