I just got back from a dyno tuning session with Valley Pro Racing and wanted to share my results/experience so here's the low down.
We did a base run on my bike (recently installed a jet kit and slipon, wanted a baseline) and discovered that it was running very very RICH. This was not overly apparent as the bike ran smooth and pulled pretty well (I recently pulled a perfectly smooth dyno run and was quite satisfied) but it was not as snappy as it should be, nor was my mileage any good (I was getting about 160 km before reserve, when I should get 200ish). It was also very tempermental when started up, but ran fine when warm.
Graham did some part throttle, half throttle, and transition runs etc to nail down the offending parts and it was decided that my mains were rich as were my needles. By moving the needles 2 clip positions we eliminated a HUGE dip, and he left me with instructions on what to do next and a promise to see it through with me when I return.
So just a tip, even if your bike seems to pull fine and pulls a nice smooth curve with no dips on a dyno, it could be way out of tune.