popping

ok so ive got the OPBS X 125cc...i just ported it and now when i have the throttle wide open it keeps almost coughing(like it keeps cutting out every couple of seconds), like its not getting enough gas. also when i am decelerating it makes pops out of the muffler. what do i need to do to the...

First off let me say this bike blows hard but then again what do you expect, it is a Chinese bike. NEVER BUY FROM ORION EVER!!!! Its a 125cc OPBS X with and after market pipe and full brand new electrical system the whole electrical system when to pot after they set the CDI on the exhaust...