I just put in new HRC exhaust tip/ and did some air box mods. Starts better, runs better. I have all the carb stuff Jets #68 / #175/ #B53E & Insl. boot thing. I just here so many "not running right" stories. Now I read on Dirtrodders.com on F.A.Q. for XR650R #14 "Some people have had bad luck with B53E needle, getting funky throttle results." I ride only in Michigan and just do not what to mess with the carb more than once. I guess my question is yes or no on B53E needle? Thanks so much for the imput!!