I accept the fact that the 600R had more power than the the 650L because everyone says it's so. Why? I know the 600R is lighter due to the lack of the starter, battery and additional bracing and other stuff (?) required to make the 650L street legal off the factory floor but mostly they are pretty darned similar The 650L has lower compression but more cc's. Those extra cc's don't seem to be helping. So considering that the engines are the same design what would it take to bring the XRL to the power/performance level of the 600R (besides losing weight)?