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In internal combustion engines with carburetors, a choke valve or 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.
The NA50, or Express II, was released in 1979 and produced until 1981. Differences include a different frame, "more comfortable" seat, tree handle bars, and a slightly larger gas tank. For the NA50's final year of production in 1981, it received the same upgrades as the NC50 (CDI, auto choke, kick start) as well as a 2-speed automatic transmission.
Since then, automatic chokes became more commonplace. These either use a bimetallic thermostat to automatically regulate the choke based on the temperature of the engine's coolant liquid, an electrical resistance heater to do so, or air drawn through a tube connected to an engine exhaust source. A choke left closed after the engine has warmed ...
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One type of reel mower, now largely obsolete, was a powered version of the traditional side-wheel push mower, which was used on residential lawns. An internal combustion engine sat atop the reel housing and drove the wheels, usually through a belt. The wheels in turn drove the reel, as in the push mower.
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In oil and gas production a choke manifold is used to lower the pressure from the well head. It consist of a set of high pressure valves and at least two chokes. These chokes can be fixed or adjustable or a mix of both. The redundancy is needed so that if one choke has to be taken out of service, the flow can be directed through another one.
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