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Two-stroke cycle of operationsThis refers to an engine that completes its full working cycle in two strokes of the piston. These engines are much simpler in construction than four-stroke engines. Becasuse two-stroke engines produce a power stroke for every single revolution of the engine, and they do not require valves, camshaft, push-rods etc. they operate at much higher speeds than their four-stroke equivalents.

Four-stroke engines only produce a power stroke for every two revolutions of the engine, and they require valves, springs, pushrods and a camshaft or camshafts to do it. For these reasons, they tend to run at much slower speeds than their two-stroke equivalents.

For example, the engine used in a concrete saw is a two-stroke engine.

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