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This has me thinking. Even with a single 750 engine, rotating cylinder deactivation could reduce the effective displacement to 250 cc for cruising on the flat, or nearly flat, and of course the down slope. (This would work on any four cylinder) If you can insert a wedge between the cam lobe, and the rocker arm of deactivated cylinders, you can keep the valves slightly open, and lessen the resistance a fully sealed cylinder would present to pulling a vacuum on down stroke, or compressing a cylinder full of dead air on upstroke. You would have to have a fuel injection system capable of being deactivated cylinder by cylinder, and single cylinder throttle bodies and air cleaners, to prevent back firing.
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