| 摘要 |
A carburetor has a conventional bimetallic coiled spring that for cold engine starts and running urges a fast idle cam to a cold position to increase the idle speed to sustain engine operation. A separate lever connected to the choke valve is pulled by engine vacuum to move the choke valve wide open, to lean the air/fuel mixture and reduce emissions. For starting purposes, the separate lever is returned to the cold start position dictated by the fast idle cam.
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