i like to scare the sh *! out of my self, but in the sand my bike cant pull the hills as well, yet...
many years ago a cop clocked me doing a wheele just under a buck thirty (or so he said, i thought it was more like 110mph)
i ride my Yz on the tight trails, the k5 is too heavy for them so she gets the wider trails and i found my self running out of gears, i also change gearing a lot depending on where i ride.