How to adjust carburetor mixture screws

Here's how to find and adjust the mixture screws on your carburetor. If you are doing an initial setting after rebuilding, turn each screw out 2-1/2 turns from lightly seated as a baseline to get the engine started. Note that metering-block style carbs such as Holley and Demon more often have one or 2 mixture screws in each metering block depending on the number of venturi. Also those may not be located at the bottom of the carb as in factory carburetors.

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