Dan Gurney's patented Moment-Cancelling Four-Stroke” (MC4S) motorcycle engine

Revolutionary motorcycle engine patented

The racer who first sprayed champagne on the podium has patented an 85% more powerful and more efficient four-stroke motorcycle engine. American racer Dan Gurney believes bringing back the double crankshaft from the old Ariel Square Four will reduce motorcycle engine vibration making it more reliable as there will be fewer moving parts. He calls it “moment cancelling”. …

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