i have an ex250 and if i start it up and let it warm up, it stalls sometimes. It usually stalls if im sitting at a light and rev the engine up, when it goes to settle back down to an idle, it just drops all the way to 0rpms and stalls. the choke is all the way off and the fuel tank is on. I plan on pulling the plug and checking for rich or lean operation. The bike has less than 2000 miles on it. The other thing i would like to do is adjust the choke and throttle cables, but i dont know exactly how to do it properly. If anyone can either give me step by step instructions or direct me to a website which shows you how to do it, i would appreciate it. also, if anyone has any other ideas as to what actions i should take, please let me know.