I've only owned the FZ1 for three days so far (I bought it thursday). I really have no idea what it is capable of, and I don't think I'll ever push it hard enough to find out. At 100 mph the tach is only reading 6400 RPM, with a 12,000 RPM redline. And the bike doesn't even start to come on the power hard until 7,000 RPM. It was amazing how easily and quickly it hit 140. I was still trying somewhat to complete engine break in, so was only at 2/3 throttle, but the bike was accelerating exponentially faster at 140, when I let off, than it was when I rolled on the power.
I don't know why we can't have engines like this R1 motor in the ATV industry. Yes it has an unbelievable amount of power, but the power has such an increadibly broad spread, and is so silky smooth and so managable that it is still really easy to control. You need to respect that kind of power, but it could certainly be used in a well designed UTV chassis.