Engine dies when i twist throttle

Hi Ive a Sinnis 125 only two years old and have looked after it from new its only done 2500mls all servicing completed but just all of a sudden over weekend i got a problem.

It starts fine and idles but when i twist throttle the rear wheel doesnt move and the engine dies? Any ideas whats going on? Looked at belt and it moves fine
Maybe i need to replace carbureator i think its a GY6 engine on ebay how much should i pay? Theres a couple of ports that i think should have rubber hoses attached but will post photos shortly Thanks

 

clean the carb with a can of carb cleaner and see if it fixes it. It's unlikely to need replacing after so few miles.

If that doesn't work then maybe you have an air leak somewhere.

 

Can you physically push it forward and backwards?

 

Yes I can push it around no problem

 

Hi thanks for info i believe problem is fixed but started new thread cause think solution might help others thanks for replays