Bajaj Pulsar 135cc Engine stalls when I try to race

Hello friends,
I am having Bajaj Pulsar 135 with me and I am a tru lover of racing.
Problem is that whenever I try to race with my friends the engine of the bike stalls. Dont know is it due to the high race or there is a defect in bike's engine. All I know that the matter is stopping me from racing.

Can you help me on that?

I think stalling problem occurs due to various reasons such as when your machine is over fueled or you haven't drive it for more than a day, cold weather, worse case when you try to race and there is less fuel left. i think visit to your nearest mechanic he will fix it.