Carter AFB Exploded Diagram

Carter AFB Exploded Diagram – 9000

AFB Exploded


1. Cover plate screw
2. Cover plate
3. Step-up rod
4. Step-up retainer spring
5. Step-up piston
6. Vacuum piston spring
7. Pin spring
8. Pump connector rod.
9. Fast idle cam connector rod
10. Countershaft lever
11. Choke connector rod
12. Pump lever screw
13. Pump lever
14. Pump S link
15. Fuel inlet fitting
16. Fuel inlet fitting gasket
17. 3/16″ Fresh air choke hose
18. Bowl cover screw
19. Bowl cover screw
20. Bowl cover
21. Float pin
22. Float
23. Needle & seat assembly
24. Bowl cover gasket
25. Plunger assembly
26. Lower plunger spring
27. Vent valve
28. Float bowl baffle
29. Secondary venturi assy. screw
30. Secondary venturi assembly
31. Secondary venturi assy. gasket
32. Auxillary valves and shaft
33. Primary venturi assembly screw
34. Primary venturi assembly
35. Primary venturi assembly gasket
36. Pump jet housing screw
37. Pump jet housing
38. Pump jet gasket
39. Pump discharge check needle, or ball & weight
40. Primary metering jet
41. Secondary metering jet
42. Idle mixture screw
43. Idle mixture screw spring
44. Coil housing retainer screw
45. Coil housing retainer
46. Choke ground wire
47. Coil housing
48. Coil housing gasket
49. Baffle plate
50. Piston housing attaching screw
51. Piston housing
52. Piston housing gasket
53. Throttle body casting
54. Base gasket
Carter AFB 9000 Carburetor KitCarter AFB Carburetor Kit

Recent Posts

Adjusting the Idle Mixture

The Carburetor Idle Circuit and Adjusting the Idle Mixture

The idle circuit is in effect only when idling. Once RPM increases above idle, the Idle mixture screws are no longer in play. If you have the idle RPM set too high, your idle mixture adjustment will be irrelevant. When you turn the idle mixture screw in all the way and the engine doesn’t change, you could have the idle RPM set too high. For example if it was at 1,000 RPM. On the other hand if the idle is normal, then you have a problem in the carburetor, or possibly a vacuum leak.

The idle mixture screws sets the mixture of fuel and air during idle RPM.

Single barrel carburetors will have one idle mixture screw while 2 barrel and 4 barrel usually have 2 idle mixture screws.
You can clean your idle mixture screws by buffing them off with a wire wheel.
Inspect the screw for grooves. Grooves are created when the screw is turned in too tight. Replace any damaged or bent screw.
Inspect the screw hole to make sure it is clear. When you blow through the hole you should get air inside the bore.

For Rochester Quadrajets pick up a idle mixture adjusting tool at most any part store. The tool bends which will make adjusting easier.

When assembling the carburetor turn the idle mixture screws in all the way, gently seat, then turn it out about 1 1/2 turns.

Bring the engine up to operating temperature.
Make sure the choke valve is completely open.
You may have to rev the engine slightly so that the fast idle cam moves to the idle position.
Adjust the idle to specification.

There are a couple of ways to adjust the idle mixture.

1. Using a vacuum meter
Hook the vacuum meter to one of the vacuum ports on the intake, or the carburetor.
Take turns with each idle mixture screw.
Turn each screw out a bit for a start (maybe 1 turn).
Turn each screw in 1/4 of a turn and wait for a second for the vacuum meter to catch up.
Do this until you get the smoothest idle and the vacuum meter stays steady.

2. By ear
Take turns with each idle mixture screw.
Turn the screw out 1 turn to start.
Turn the screw in 1/4 and wait for a second for the engine to catch up.
Keep doing this until the RPM starts to drop.
Turn the screw back 1/4 – 1/2 turn.

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