Dynos are very ineffective for gauging REAL HP. They're only true design was as a tuning aid. Sooo many factors can change your readings;
Temp, Humidity, Elevation, Vehicle temp, Type of dyno, what mode the tuner had the dyno in (SAE, Standard, Corrected), and Smoothing are a handful of factors. I wouldn't read much into it. FWIW I had a bike that should have made 170whp and when I had it dynod it only put down 155 so I asked the tuner why that was, he fiddled with the settings and smoothing, made another run and it put down 167.
