i have the same problem?

well take the air filter box off the left hand side of the bike then you can get to the carb easier.then undo the two nuts that hold the carb on and then turn it upside down,some fuel will run out but not much,then undo the screws on the bottom that hold the float bowl on and then remove it by lifting it off,there is two jets in the bottom of the carb the biggest one in the middle is the main jet and the other one is the pilot jet for slow engine speeds,undo them both and pull them out and then make sure they both have a hole through them it may need some cleaning but do not make the holes bigger than they should be or it will run too rich .then just put it all back together.i would suggest draining the tank and re filling with fresh fuel too ,it dont last very long at all and will make the bike run sh*tty ok m8

adam bike doctor
February 2007