Originally Posted by muddi1
Looking at the passanger side of the carb in direct line of the secondary butterfly rod you will notice the area is rectangular shaped, beind this casting is a spring. If you look close you will see a standard screw (straight) slot on the underside of (the top cover) that little rectangle is an allan head screw that is the "locking" screw for that rod and spring. If you carefully loosen that allen head screw and with a screwdriver in the slotted screw. (This is important becasue if you lossen that locking screw too much that adjusting screw can and most often does take flight.) That secondary spring can be adjusted. Clockwise to tighten the spring and counter to loosen.
I set mine to a "baseline" when I have the carb off. I loossen the locking screw and adjust the spring until it just touches the pin that sticks out of the rod behind thta little rectangle area. Once it touches I tighten the ad=justing screw 1/4 to 1/2 turn and lock it down. If I recall correctly the rebuild sheet in a Quadra-Jet rebuild kit calls for 3/4-7/8 once the spring touches that pin.
This will allow the secondaries to open easier=sooner.
If the carb has a rear pull-off canister it may be in the way to adjust the spring. Here are a few pic's....it is to the top and left in the first pic, it can be done with the carb on but it is much easier when it is off the manifold.
Hope this helps.
Best reply right here, was going to say the same thing. I like to tighten them quite a bit, then gradually loosen the spring tension to where they just bog. Turning the screw in 5 minute intervals as if you were looking at a clock helps to know where you are.
As long as it is running fine except for the bog, this is all you will have to do.