Thread: setting the idle on a 750 double pumper???

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Are you sure that you turned the idle mix screws? The idle mix screw is on Figure 4 just under the "timed spark vacuum port". There is one on
each side of the metering plate. Turn the screw in until it is LIGHTLY
seated and then turn it out 1 1/2 turns. This will get you in the ball park.
Next, set your idle speed using the screw on the linkage. Then, go back
to the idle mix and turn one IN until you see the engine slow down on your tach....turn it back out just enough for the engine to speed back up.

Caution! Later model holley idle mix screws are backwards.....they start in the "out" position!! Make sure your "list" number on the air horn matches the instructions.

mike in tucson