Choke valve

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Notion

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Science and technology

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What Wikipedia says

In internal combustion engines with carburetors, a choke valve or simply choke modifies the air pressure in the intake manifold, thereby altering the air–fuel ratio entering the engine. Choke valves are generally used in naturally aspirated engines to supply a richer fuel mixture when starting the engine.

Excerpt from the Wikipedia article “Choke valve”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: SealyPhoto, CC BY-SA 4.0, via Wikimedia Commons.