I'm pretty sure they are getting close to 100bhp in the super twin (or lightweight) class of Irish road racing. Their bikes are based on the Ninja 650 motor or the SV650 Suzuki but most are the Kawasaki.
On the Isle of Man James Hillier averaged 119.130 mph (191.72 km/h) for a single lap of a four lap race. They have to keep them at 650cc and must have the engine out of a bike that was for road use sale. Ryan Farqhar has set up KMR racing and builds these bikes for race use and from all accounts they are tops.
On a little side note about Ryan Farqhar he holds the record for road race wins. Even more than Joey Dunlop. He decided to retire in 2012 after his uncle crashed at the Manx GP on a bike Ryan built for him.
Falling down is your bodies way of saying you just screwed up.