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A2Difficulty 3/5

A motorcycle engine completes its cycle in four piston strokes and two crankshaft revolutions. What is this cycle called?

Correct answer

Four-stroke.

It is a four-stroke cycle. In a conventional petrol engine it comprises intake, compression, combustion-expansion and exhaust. Identify stroke count from the operating cycle, not merely from putting petrol without premixed oil into the tank: some two-stroke engines have a separate oil supply. Always follow the fuel, lubricant and procedure specified for your model.

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All options

  • Two-stroke, which always needs four strokes per cycle.

  • Four-stroke.

  • An electric motor, which does not use pistons.

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