Wonder how bigger cliff you need to push an 1100 sport off to get 91ps, obviously a theoretical crank number and not a rear wheel number. I have had the valve guides K lined on my 1100 sport, although there was a extra 1 at the front of the odometer reading and it was having a lot of other machining done at the time. Be worth remembering getting more hp out of the sport is a exercise in rolling a turd in glitter, the factory had already stretched things pretty much as far as they could go.