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On a 2 stroke engine, each cylinder fires every time the piston comes up. On a 4 stroke engine, the cylinder only fires every OTHER time the piston comes up.

4 stroke engines have 4 strokes: Intake, compression, power, and exhaust.

2 stroke engines complete these cycles in only two strokes of the piston by use of ports in the cylinder walls.

2 stroke engines usually produce more power for a given weight/size. But, in gasoline engines, 2 stroke engines are typically less efficient (use more gas) and have much higher pollution levels (note: some newer "direct injection" 2 stroke engines do much better on pollution levels than the typical 2 stroke)

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on what machines?

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Q: 2 stroke vs 4 stroke
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How do you set timing on 2 stroke 2 cylinder engines?

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