Carburetor - Carter YFA 1-Bbl: Overhaul: Disassembly

NOTE: Use new gaskets and seals. Make sure that new gaskets fit correctly and that all holes and slots are punched through and correctly located.

Remove carburetor from engine. Remove thermostatic spring housing assembly, spring housing gasket, locking and indexing plate, and fast idle link and bushings.
On Feedback carburetor, remove WOT A/C cut-out switch, if equipped, and bracket. Remove throttle control device.
Remove 2 screws disconnecting choke pull-down link. Remove pulldown motor assembly. Disengage link from choke shaft lever.
On all carburetors, remove fuel filler inlet. Remove air horn assembly attaching screws, solevac or solenoid, air horn assembly and gasket.
On Feedback carburetor, remove feedback solenoid and gasket. On Non-Feedback carburetor, remove wire clip retaining the link that joins the fast idle choke lever to fast idle cam and remove link.
On all carburetors, turn air horn upside-down and remove float pin, float and lever assembly.
Turn air horn right-side-up and catch needle pin, spring and needle as they fall out. Remove needle seat and gasket.
Remove choke plate attaching screws. If necessary, file staked (burred) ends of choke plate attaching screws and remove. Be sure to use new screws when assembling.
On all carburetors, remove spring retainer from mechanical fuel bowl vent flapper valve. Remove vent shaft rod and spring and flapper valve. Note position of spring on rod for reassembly.
Turn main body upside-down and catch accelerator pump check ball and weight. Remove bowl vent lever screw in end of throttle shaft. Remove spring washer, vent rod, actuating lever and clip.
Loosen throttle shaft arm screw. Remove arm and accelerator pump connector link. Remove fast idle cam and screw.
Remove accelerator pump diaphragm housing screws and pump transfer tube. Lift out pump diaphragm assembly, pump lifter link and metering rod as a unit. Remove lifter link seal.
Disengage metering rod arm spring from metering rod. Remove metering rod from rod arm assembly. For reassembly, be sure to note location of any washers that were used for shimming either spring.
Compress upper pump spring and remove spring retainer. Remove upper spring, metering rod arm assembly, and pump lifter link from pump diaphragm shaft.
Compress pump diaphragm spring. Remove pump diaphragm spring retainer, spring and pump diaphragm assembly from pump diaphragm housing.
On Feedback carburetor, using a sharp punch or awl, remove temperature compensated accelerator pump bleed valve plug from outside main body casting. Loosen bleed valve screw and remove valve.
On all carburetors, use proper size jet tool or screwdriver to remove metering rod jet and low speed jet. Remove screws and separate throttle body flange assembly from main body casting. Remove gasket.
Remove throttle plate retaining screws. File staked (burred) ends if necessary, and use new screws at reassembly. Slide throttle shaft and lever assembly out of throttle body. Note location of torsion spring ends on throttle shaft for reassembly.
Remove idle mixture screw adjustment limiting cap and cup as follows: Invert carburetor assembly and tape all vacuum and fuel connection openings.
Using a hacksaw, saw a slot lengthwise through thickness of cup. Be careful not to touch throttle body with saw blade. Insert screwdriver in new slot, spreading outer cup enough to remove inner cap.

Fig 1: Exploded View of Carter Model YFA 1-Barrel Feedback Carburetor (YFA Similar)
After removing limiter cap, count number of turns to lightly seat needle for reassembly reference. Remove screw and cup. Clean metal shavings from carburetor and remove tape from openings.