1) Why can motorbike engines rev so high? Presumably it's the sports bike ones - are they two cylinder ones?
2) When I hear people rev them up, the revs seem to go up and down very fast, is that cos of the lower mass of the moving parts or what?
3) What kind of stroke/bore do they have? Presumably this contributes to high revving?
4) Why aren't they turbocharged? That'd give more power for smaller physical size, surely?
Tell me about motorbike engines please.