Have a Carter AFB Competition Series carb. Finally hooked up the electric choke and it works fine. But the fast idle cam doesn't drop down far enough to engage the fast idle screw. I'm wondering if the choke shaft is installed funny. As shown in the pic, the tab on the throttle side is on top and rotates clockwise as the choke opens. Looks like it should be on the bottom to let the cam move down to the screw. Looks like it would be possible to put the shaft in 180 deg out of phase. Any enlightenment would be appreciated.
Roger: You are correct...I've seen this a couple times from the factory. It's an easy fix, ten minutes if you don't lose the small screwsou: Frank. p.s. Your accelerator pump adjustment is set to the minimum (rod in the hole farthest from the pivot). Happy motoring, Frank
Thanks Frank, Only rebuilt one carb before and that was an old simple two barrel. So, a four barrel is very complicated to me. Didn't rebuild this one, it came with the car and runs pretty good really. But with your blessing(?) will attempt to reverse it. I know what you mean about the screws, I already invisioned one falling down into the manifold. Better stuff some rags in there first and have a magnet ready!:laugh: Maybe I will try the next hole in the accelerator pump arm. A little more oomph can't be bad.
Don't be afraid of the AFB...It is one of the easiest carbs to work on. The simplicity of the design is classic. It might be easier than that two barrel you did. The accelerator pump adjustment...if it is running good where it is I would leave it alone...more gas does not necessarily mean more power; if it doesn't stumble off idle it is fine. All ahead full!!! Frank
Frank, since you've been so helpful, I'll pop another ? to you. I noticed that the secondary throttle plate is slightly open. Should it be closed all the way? It moves freely if I flip the counter weights. BTW, I don't intend to rebuild it because other than the fast idle thing the car runs great. Maybe I won't mess with the accelerator pump, because like us old guys say, "If it ain't broke don't fix it!" I wish I could find the guy that put the car together. I bought it from a guy that bought it from him (he was moving I guess). Anyway I always wondered why the choke hot wire wasn't hooked up, and for summer driving wasn't a big deal so didn't mess with it. Found the wire and hooked it up and the choke worked fine, opened like it should. Figured there was a problem or it didn't work. So guess I'll find out with some more driving. Thanks, again.
That is the secondary "air valve', and it is fine, as it works as air is pulled through the carb. It keeps the engine from "stumbling" if the secondaries are suddenly opened wide. The throttle butterflies directly below the air valve are in control of the air flow. Good luck, Frank
Continuing with carb 101, duh, I see now. Never saw one with the air valve so low in the body. Anyway got the choke shaft reversed 180 deg. Didn't loose any screws either! Seems to work fine. Took it for a spin and made it back home. Don't think I will change the accelerator pump hole, it's real snappy off the line as is. Thanks again.:beer
