Choke
Thread Starter
Racer
Joined: Jan 2007
Posts: 383
Likes: 33
Choke
Just had the original AFB carb rebuilt for my 63, runs great, only problem when cold I set the choke to start and it does not work, so i have to pump the gas to keep it running till warmed up....question how do you set the choke to make it work properly. thanks Mike
Race Director
Joined: Jan 2002
Posts: 15,354
Likes: 2,726
From: Close to DC
C2 of the Year Finalist - Modified 2020
First make sure the engine is dead cold. Assuming it's an original electric choke and it's not moving in the close position. Make sure you two leads are hooked up correctly. If necessary test with a test light. If so, it may just be the choke coil (black bakelite circular thing) on the side of the carb is turned in the wrong direction. Look at it, should read lean in one direction and rich in the other with the cover having a raised pointer so to speak. You want to just loosen the two or three screws enough to turn the cover toward rich by a couple of notches. Hit your throttle linkage as if your starting the car. The choke butterfly should close most of the way, maybe except for a 1/4 inch. I don't have the exact spec for this, but someone here on the forum may. After this, it should get you in the ball park and then tweek it from there. Good luck!
Dennis
Dennis
Race Director
Joined: Jan 2002
Posts: 15,354
Likes: 2,726
From: Close to DC
C2 of the Year Finalist - Modified 2020
I see now it's a heat stove choke. Heat source from the right side exhaust manifold. The bakelite cover still should have a gradation on it for lean and rich. Is the choke butterfly closing/moving at all when you trip the throttle linkage. If not, you don't have enough tension on it or its not hooked up correctly. As the tube passes heat up to the thermostatic coil it expands and takes the tension off of the linkage, thereby opening the choke to full verticle. Keep at it. Dennis
Dennis
Last edited by Bluestripe67; Oct 26, 2009 at 09:53 PM.
Burning Brakes
Joined: Aug 2002
Posts: 1,145
Likes: 0
From: Texas
St. Jude Donor '09
Just had the original AFB carb rebuilt for my 63, runs great, only problem when cold I set the choke to start and it does not work, so i have to pump the gas to keep it running till warmed up....question how do you set the choke to make it work properly. thanks Mike
Racer
Joined: Nov 2006
Posts: 461
Likes: 0
Non electric choke 63
I have same afb set up on my 63 swc. There is a moving piston inside the choke housing. This is worked by a thermostatic spring (coil). Try cleaning area and make sure piston slides freely in housing. I used fine emery to clean up piston and this corrected my problem. good luck, Abe G
Le Mans Master
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
I have same afb set up on my 63 swc. There is a moving piston inside the choke housing. This is worked by a thermostatic spring (coil). Try cleaning area and make sure piston slides freely in housing. I used fine emery to clean up piston and this corrected my problem. good luck, Abe G
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Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
The end of the bimetallic spring in the choke housing engages the tang on that lever, which sets the choke plate full closed for cold start, and as the engine warms up, hot air from the tube in the exhaust manifold causes the bimetallic spring to relax, fully opening the choke plate.
