Well, because I'm not familiar with the exact characteristics of this bike when it's properly tuned. I'm still trying to figure that out, that's why I messed with it. It seemed to be a little bit laggy below 5k RPM at the 2.25 setting. So, I tried a few other settings. It's at 1 1/2 now, and runs pretty good, but I still don't know why the RPM's linger around 3000 after I release the throttle. What's the solution to that?