pit pro 140cc

Hi everyone, i bought a pit pro 140 off a mate, and its got a few problems, but the main one is the fuel mixture screw is stuck and cant be undone so its running fairly rough. It blows lots of smoke out of the exhaust and chokes when you go full throttle. Does anyone know how to get the fuel...

Hey, Just wondering if anyone knows much about this bike. Is it built well and will it be able to jump without breaking?? This is going to be my first bike so i want it to be a good but not to expensive one. Pitpro 140XR | PitPro Dirt Bikes Australia's Largest Online Pitbike Store Thanks