As promised, the test results are in. Acceleration was 9.77 sec, averaged of 8 runs. The stock, baseline time was 10.51. Almost 3/4 second improvement. I was a little disappointed, hoping for a little better than that, but I may have had hopes that were a bit out of line with reality. That 9.77 sec. is almost identical to what I got with Drillers own 200 Vespa. Top speed results were more disappointing, 56.5 mph two way average using GPS. Speedo was indicating 61. This is right where we started with the stock bike. Many modern bike do have a rev limiter built into the ignition system. Don't know if the Fly has that or not. I did run the bike on a long downhill and got it to indicate 69MPH. This would seem to rule out a rev limiter, but, most bike use a "soft" rev limit. This retards the ignition to reduce power, not cut the ignition off. So, it may be the bike does have a rev limiter, but will still run higher rev's on a downhill. Does anyone have any knowledge on this? Really would like to know. I'm now getting even more backfire on deceleration than ever, it's really bad. Bike idles a bit rough and will not start when hot unless the throttle is opened. I did try to adjust the idle mixture but didn't seem to make much difference. Screw was out 2 turns to start with. Driller has the tool to do the adjustment, but it isn't very easy to get to so don't know exactly where it is now.