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How Carburetors Work

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Idle screws located on the metering blocks can often cure a rough-idling motor. Turning the screw clockwise leans the mixture, while turning it counterclockwise richens the mixture. However, in certain emission "reverseidle" carbs, the exact opposite is the case.
How Carburetors Work - Carbin' It Easy

 Idle screws located on the metering blocks can often cure a rough-idling motor. Turning the screw clockwise leans the mixture, while turning it counterclockwise richens the mixture. However, in certain emission "reverseidle" carbs, the exact opposite is the case.  View Related Article

 

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