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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Four-stroke.
Two-stroke, which always needs four strokes per cycle.
An electric motor, which does not use pistons.
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