How a two-stroke engine fires once per revolution

Technology · Published 7 October 2026 Swipe more like this →

In short: This video breaks down the mechanics of the two-stroke cycle. You will learn why these engines require oil to be mixed directly into the fuel and how their firing frequency differs from standard four-stroke engines.

The video explores the fundamental mechanics of the two-stroke engine cycle. Unlike a four-stroke engine, which fires every other crankshaft revolution, a two-stroke engine completes its cycle and fires once per revolution. Because the crankcase is exposed to the air/fuel mixture, oil must be added to the fuel to ensure proper lubrication.

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