The RPM at maximum power has nothing to do with either the valve train or piston speed. It's a function of breathing, and that includes everything from the air filter to the carbs to the cam/s to the exhaust. It's the design of the system as a whole that determines where max HP will occur. Likewise, this number has nothing to do with maximum safe motor RPM. Even an otherwise stock small block Chevy will spin reliably to 8,000 or better, simply by installing lightweight valvetrain parts and stiffer valve springs. Based on that, it should be clear that the DOHC design is being used in our bikes for cost purposes, not RPM.
