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How Carburetors Work

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The Holley-style modular design offers easy fuel level-adjustment, and it's accomplished similarly to this Demon carb cutaway. The needle and seat can be externally adjusted by simply turning this screw.
How Carburetors Work - Carbin' It Easy

 The Holley-style modular design offers easy fuel level-adjustment, and it's accomplished similarly to this Demon carb cutaway. The needle and seat can be externally adjusted by simply turning this screw.  View Related Article

 

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