idle jet

slow-running jet

slow-running jetclick for a larger image
A fine jet in the carburetor of a reciprocating engine, which alone supplies fuel when the throttle is at the idling position. Also called an idle jet.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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About 500 of the idle jets were undoubtedly valuable equipment, since they were fairly young, had good fuel consumption and met all noise requirements, said Dan Solon, an analyst with industry consultancy Avmark International.