What can be done with carburetor tuning?
Tuning the stock carburetor is fairly easy, through fuel screw adjustments for the pilot range, and needle clip adjustments and main jet changes for the mid and high ranges of throttle operation. If you make the intake and /or exhaust systems less restrictive through the above mentioned airbox/filter modifications and /or an aftermarket exhaust, you will probably have to go richer on the main jet, and raise the needle one or two clips for best performance. On the later model bikes, the main jet is easily changed without removing the carb, as there is an access cover on the bottom of the float bowl. In order to change the needle on the Keihin carb, the carb must be removed, but it still is not too hard of a job to change the needle clip position. There has been much written about carb tuning through jetting changes, needle clip position, different needles, fuel screw position, etc., but the main thing to remember is to only make one change at a time, then test that change, before going
