I agree with Dan, it's a great track bike. I spent a day in the desert on a pre-production YZ 426 last month, basically trying to ride around on our normal dual-sport loops. The bike was insanely fast, and just begs to be ridden that way. Part-throttle cruising is virtually impossible, it's either WOT or coasting, with very little engine braking.
absolutely forces you to race it agressively, which by the way wore me out in 20 minutes
Of course, nobody could catch me either
Whoops? Just gas it and skim over the tops, really amazing. My buddies on WR's and XR's were also worn out after 20-30 minutes on the bike. It's got a nice feel on the new oversized front brake rotor, and very stiff suspension, so no sitting allowed (I'm 150 lbs). Very close ratio gearing, 1st is tall, and 5th is not tall enough for the street. No downshifting needed on dirt roads, just crack the throttle a bit and let the spinning rear wheel
catch you back up to speed...