The Carter AFB four-barrel carburetor has been among the most popular choices among automotive enthusiasts for decades. Known for its chrome finish, the AFB is also known for its user-friendly adjustment points. Among the most common adjustments are the carburetor’s air/fuel mixture. A mixture which contains too much air will cause the engine to hesitate upon acceleration and potentially destroy the pistons. A mixture which contains too much fuel will decrease the engine’s power. Fortunately, the carburetor need not be disassembled to adjust the mixture.

Step 1

Turn the engine on and allow it to warm up.

Step 2

Locate the two large slothead screws at the bottom of the front of the carburetor. These are the air/fuel mixture screws.