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Automobile engines require four strokes to complete a cycle and are much heavier because they require extra systems and components, which make them cleaner and more efficient. Description from washingtonpost.com. I searched for this on bing.com/images

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from About.com en Español

Potencia y par motor se refieren a la fuerza que genera un motor

Potencia y par motor definen la fuerza que genera un motor #4strokeengine motor de 4 tiempos

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Powered by the 250cc liquid cooled, four stroke engine, the 505 pound machine comes with added features to reduce fuel consumption even when running at a decent speed of 65mph. The designer states that the fuel efficiency drops to 105mph when some bling is added to the vehicle in the form of sporty steering, bling wheels and a couple of other mods to improve the looks of the trike.

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1966 Honda Motor Scooter vintage ad. You meet the nicest people on a Honda. The rugged four stroke engine gets up to 200 miles to a gallon of gas. The world's biggest seller. Original MSRP $215.

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An example of ETW's Kiwi Mk II plans (The "Kiwi" 15cc Four-stroke Petrol Engine) and made from bar-stock. This would be a neat project some day!

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