crashcourse
XS650 Addict
I've been waiting a long time for this. I finally got the bike back on the dyno! I did an initial dyno run a few months ago as a baseline before I started doing any modifications. The attached .pdf file shows the results. The bike is a 1981 Special. It previously had no modifications. Over the summer I changed from the stock exhaust to a 2-2 system from Gordon Scott Engineering, and that is the data marked as "Modified" in the chart.
You'll notice that peak power has hardly changed, but there is a big boost in mid-range torque about 4200 rpm, and I am especially excited to see the boost in torque from 2800 to 5000 rpm, which is where I do most of my riding. Peak torque has moved up a bit from where it was, and the curve is definitely less smooth, but it rides great and sounds awesome.
I neglected to get any pictures or video on the dyno, but this video gives an idea of the sound.
You'll notice that peak power has hardly changed, but there is a big boost in mid-range torque about 4200 rpm, and I am especially excited to see the boost in torque from 2800 to 5000 rpm, which is where I do most of my riding. Peak torque has moved up a bit from where it was, and the curve is definitely less smooth, but it rides great and sounds awesome.
I neglected to get any pictures or video on the dyno, but this video gives an idea of the sound.