Jamie R

Hi Guys, I've got a 2000 SR125 and I'm having a few problems with it cutting out when the throttle is opened up. When the bike is running, having been choked and warmed up, sometimes it will splutter when I open the throttle a little. If I try to really open the throttle, it usually leads to the engine cutting out completely. Can anyone point me towards what is wrong? Thanks in advance. Jamie