Rich,
Barry charges by the hour for Dyno time which is the norm for dyno service. Give Barry a call for his rates. I was there all day because I was trying different port timing, ingnition, jetting,needles, atomizers, mufflers and so on. not being a expert but would think with a Rotax you could try a lot in a few hours. To save yourself time you need talk Barry to come up with a plan of attack before you set up to make runs.
We made 3 or 4 baseline runs so we had a good baseline. Then would make atleast 3 runs for every change to make sure we would see good numbers and they repeted. In all we made 65 runs because I had a very long list of things I wanted to try. at the end we went back to the baseline to confrim were we started and what we learned.
What is interesting is what I thought would make a big + or minus change in some case would make not much difference at all and what I thought a minor change would pick up a horsepower or more. To me what was more important than a big peak hp number was how much we improved the performance below the curve which improves drivablity and the way the engine pulls off the corner.
For me what I learned was worth twice the price, plus I had a lot of fun.