It is possible to bore and stroke the engine to around 1100 CC, but it requires an aftermarket barrel casting and machining the crankcase. There is a guy in Sweden that is getting well over 100 HP from one that he races, but I doubt it would be much fun as a daily rider.

And remember, less weight = free HP.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python