A friend of mine has a 2006 CRF250R that he wants me to check out for him. The bike will start up easy and idle for a couple seconds and die. The motor sounds fine when idling, it has no strange noises. I'm thinking carb needs to be cleaned and i'm going to check the valve gaps also. Anybody have any other ideas? He doesnt have a service book for it so if anyone could give me the valve gap clearances I would be thankful.