Im sure everyone would agree that in order to make the pig purr, jetting needs to be spot on. Just how does one go about obtaining crisp carburetion? <?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o> </o> Not being one to solve every problem that comes along with my MasterCard, I am determined (with your help) to set up my stock Keihin for optimum performance. My research on carburetor jetting in general has failed to yield specific information about how each component contributes to overall performance. <o> </o> My overall aim here is realize how performance is altered when these three variables are changed. Main jet size Needle clip position Pilot jet size <o> </o><o> </o>The Pig Pen site has a great section on choosing baseline carb settings for your altitude, temperature, and performance modifications. http://www.xr650r.us/jetting/ Which should get you close to the crisp responsive carburetion were all after. But how do I coralate what the bike is doing , bogging of idle forinstance, with which component needs adjustment or resizing? The Art of Fine Tuning! Am I asking the imposibility here? Is someone able to explain the interelationship of jetting changes to rideability characteristics?