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There was a guy that went by " Dr. Dyno". that used to tune bikes on his dyno . I saw him a few times in jersey doing his thing. A few guys would bring their home built / tuned bikes to him and he basicly would get them to rum better by rejetting their carbs. I saw him take a backfiring ,spitting , coughing Road King and smooth it right out by jetting it properly. He could probably do a proper tune on a bike, but at these events he just gets them to run somewhat acceptable, takes their cash and moves onto the next one. But I wouldn't except a perfect tune at a traveling event show.,,,
Very loosely, they can only do a little bit of work in the short time they play with your bike. Most work will likely be canned, which isn't inherently bad, but it's optimized for your specific bike either. It lets you see how your bike dyno's, and if some easy tuning can be done, it will be.
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