WARNING: These are general instructions, your specific carburetor may have variations of instructions and diagrams. Take pictures as you disassemble your carb to reference on reassembly.

DISASSEMBLY

1. Remove attaching screws and reatiners, thermostatic spring housing assembly, spring housing gasket, spring housing baffle plate and fast idle link. Remove air horn assembly attaching screws, dashpot or solenoid bracket assembly, air horn assembly, and air horn gasket.
2. Turn air horn assembly upside down and remove float pin and float and lever assembly. Turn air horn right side up and catch needle pin, spring and needle. Remove needle seat and gasket.
3. Remove air cleaner bracket, then remove choke plate attaching screws. File staked ends, if necessary, and use new screws at reassembly. Remove choke plate from air horn, remove choke link lever and attaching screw. Rotate choke shaft and piston assembly counter-clockwise until choke piston is out of choke piston cylinder, remove assembly from air horn. Remove piston pin and piston from choke piston lever and shaft assembly.
4. Turn main body upside down and catch accelerator pump check ball and weight from the discharge. Loosen throttle shaft arm screw and remove arm and pump connector link. Remove fast idle cam and shoulder screw. Remove accelerator pump diaphragm housing screws, lift out pump diaphragm assembly, pump lifter link, metering rod and fuel bowl baffle plate as unit.
5. Disengage metering rod arm spring from metering rod, remove metering rod from rod arm assembly. Note the 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 the pump lifter link from the pump diaphragm shaft. Compress pump diaphragm spring, remove pump diaphragm spring retainer, spring, and pump diaphragm assembly from pump diaphragm housing assembly.
6. Using the proper size jet tool or screwdriver, remove metering rod jet and low speed jet. Remove retaining screws and separate throttle body flange assembly from the main body casting. remove body flange gasket. Remove throttle plate retaining screws. File staked ends, if necesary, and use new screws at reassembly. Slide throttle shaft and lever assembly out of throttle body flange assembly. Note location of the ends of torsion spring on throttle shaft for proper reassembly. When removing idle mixture limiter cap, be sure to note the position of the tab. After removing the limiter cap, count the number of turns to lightly seat the needle, this information is necessary to correctly position needle at reassembly.

CLEANING & INSPECTION

Wash all parts in carburetor cleaning solution (we have recommendations on the carb cleaning tech page). CAUTION: Do not immerse accelerating pump diaphragm, power valve, secondary operating diaphragm, and dashpot assembly in solution.

Inspect all parts for wear or damage and replace if necessary. Blow out all passages with air and clean with small nylon cleaning brushes.

REASSEMBLY

To reassembly: reverse disassembly procedure while noting the following:

1. Position throttle plate on the throttle shaft with the. notice in the plate aligned with the slotted idle port in the throttle body flange. Install throttle plate attaching screws snug, but not tight, move shaft back and forth and rotate it to be sure the throttle plate does not bind in flange bore. It is necessary that the throttle plate should close tight in the bore, therefore, the idle speed screw should be backed out sufficiently to insure it does not contact the throttle stop. Reposition the throttle plate if necessary, and tighten screws and stake (or peen) the screws in place.
2. Be sure vacuum passage in the diaphragm housing is aligned with the vacuum passage in the main body.