What are the differences between a 2-stroke engine and a 4-stroke engine?

Question

Accepted Answer

2-stroke engines have a power stroke every revolution, while 4-stroke engines have a power stroke every other revolution.

2-stroke engines have a simpler design with fewer moving parts compared to 4-stroke engines.
2-stroke engines require a fuel-oil mixture for lubrication, while 4-stroke engines have a separate oil reservoir.
2-stroke engines are lighter and more compact than 4-stroke engines, making them popular in applications where weight and size are critical.
2-stroke engines produce more power per cycle but are less fuel-efficient and produce more emissions compared to 4-stroke engines.
Examples of 2-stroke engines include chainsaws, leaf blowers, and some motorcycles, while examples of 4-stroke engines include cars, trucks, and most generators.

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