Thanks again, TAZ. I've had a look at your example and come up with this;
Suzuki GSF600 Bandit engine:
Power: 72bhp @ 10300rpm = 36lbft
Torque: 40lbft @ 9400rpm = 72bhp
Suzuki GSX-R600 engine:
Power: 95bhp @ 11000rpm = 45lbft
Torque: 45lbft @ 10000rpm = 86bhp
Assuming that these figures are correct, I still think that the GSX-R engine is producing more power because it's producing more torque. But it's not a proportional relationship, so at first glance it dosen't appear so.
As you mentioned though, it's probably not a fair comparision, since other things change between the engines, not just the bore/stroke.
I don't know much about motorbikes, but I can believe that you're correct about the GSX-R being 'revvier' and having to change down to overtake. But I suspect that this may be effected by gearing as well as engine characteristics.
Do you know the maths behind the bore/stroke change argument? Needn't be precise, or take into account all the little subtleties, just 'rule-of-thumb' stuff would do. Perhaps if I could model an imaginary engine and change those parameters it may still prove you right. wink
I told you I was sad, didn't I?!