Hi I was wondering if any of you Guru's out there could explain jetting for me. If I knew better what was going on in the carb I think I would be able to tune my bike better. I have an XR650R with the baja kit stroker exhaust and vented airbox cover. Right now I am running a 65 Pilot jet, "airflow?" and a 200 Main Jet "fuel flow" I didn't check what the clip position is. It runs good now but as the weather gets colder and elevation higher it might backfire and pop. "to lean?" Other mods. Pro-Taper GPS steering stabilizer. 3.4 IMS w/dry break excel gold wheels CR500 shock, precision concepts fork. Very smooth and very fast.