YFZ450 @ 90 doubt it. stock gearing and a 26" dia studded out rear on the ice at Lanzies its it 85 tapped. and it was sketchy as fuck, the air was lifting the front end from the plastics. Stock off the floor tapped its a 70mph machine.
KTM625 hits 112 with more in it, BUT the aerodynamics and lack of steering damper makes it really dumb to try.