Rebuild Instructions (Carter YF/YFA)
Identification (Carter YF/YFA)
Diagrams and exploded views (Carter YF/YFA)
Specifications (Carter YF/YFA)
Misc. images and part ID (Carter YF/YFA)
Check weights and pump discharge (Carter YF/YFA)
Metering circuit (Carter YF/YFA)
Needle and Seats (Carter YF/YFA)
Fuel bowl vent adjustment (Carter YF/YFA)
Metering jet and rod sizes (Carter YF/YFA)
Accelerator pump circuit (Carter YF/YFA)
938S Accelerator stumble tech sheet (Carter YF)
Hard to start when hot (Carter YF/YFA)
Bogging & Hesitation (Carter YF/YFA)
Fuel leaking from throttle shaft (Carter YF/YFA)
Fuel dribbling from main discharge (Carter YF/YFA)
Idle doesn’t kick down when coming to a stop (Carter YF/YFA)
Only runs when choke is open (Carter YF/YFA)
The Carter YF and YFA carbuetors are made up of three main assemblies; air horn, main body, and throttle body. The air horn contains the choke plate, internal vent for fuel bowl, automatic choke control with electric assist (if equipped) and float assembly.
The main body contains the accelerator pump assembly, metering rod, low speed jet, and main discharge nozzle.
The throttle body contains the throttle plate and idle mixture screws.
There is a lot of erroneous information in the classic car world about the Carter YF vs YFA carburetor.
Basically the YF & YFA is the same series carburetor. The YFA is just a later version of the YF but built with emissions standards.
One of the easiest ways for me to tell them apart is that the YFA uses an aluminum base, while the YF used a cast iron base.
