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Power, or horsepower as is often quoted, is not a product of displacement. It is a measure of work (torque) over time (in this case rpm). In order for a twin to compete with a four of similar displacement, it has to be able to rev to similar numbers. (Approx. rpm BMW-14,000, Duc 10,000) To achieve this the valves have to be huge, so that they can allow the engine to pump that much air, (commonly measured in cubic feet per minute, cfm) at that rpm. In order to have such huge valves the bore must be increased and the stroke reduced. The problem for conventional valve train designs is that valve springs cannot cope with such heavy valves at such high rpm. Ducati use a mechanical system to open and close their valves, so no valve springs, and also no loss of power from having to depress those springs. Checa is not riding the most powerful bike. He is riding the easiest bike to go fast on. If Rossi was riding the Aprillia who would be leading the championship?