Holley 2 barrel carb running rich how to adjust?

Answer 1

• 1

  Locate the curb idle speed screw and the idle mixture screw; both can be found at the base of the two-barrel Holley carburetor. Turn the screws carefully with a screwdriver or allen wrench depending on which type of screw your carb uses in a counter-clockwise direction, until the screws bottom out and you feel resistance.

• 2

  Turn both screws clockwise 1 1/4 turns to use as a starting point to adjust the carburetor. Start the motor, letting it warm up for about five minutes.

• 3

  Remove the rubber vacuum hose from the vacuum port on the side of the carburetor. Attach a vacuum gauge to the vacuum port.

• 4

  Adjust the screws, moving them 1/8 of a turn at a time in a clockwise direction, alternating back and forth. Continue adjusting until both screws have readings of 600 RPMs on the vacuum gauge.

• 5

  Remove the vacuum gauge from the vacuum port on the carburetor, by hand. Attach the vacuum hose to the vacuum port.