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

Use a separate container for the componet parts of the various assemblies to facilitate cleaning, inspection, and assembly.

The following is a step-by-step sequence of operations for completely overhauling the carburetor; however, certain components of the carburetor may be serviced without a disassembly of the entire unit.

  1. Remove the attaching screws and retainers, the thermostatic spring housing assembly, spring housing gasket, spring housing baffle plate, and fast idle link.
  2. Remove the air horn assembly attaching screws, dashpot or solenoid bracket assembly, air horn assembly, and air horn gasket.
  3. Hold the air horn bottom side up, and remove the float pin and float lever assembly. Turn the air horn assembly over and catch the needle pin, spring, and needle.
  4. Remove needle seat and gasket.
  5. Remove the air cleaner bracket. Remove the choke plate attaching screws. File the staked ends, if necessary, and use new screws upon reassembly. Remove the choke plate from the air horn assembly. Remove the choke link lever and attaching screw. Rotate the choke shaft and piston assembly counter-clockwise until the choke piston is out of the choke piston cylinder. Remove the assembly from the air horn. Remove the piston pin and piston from the choke piston lever and link assembly.
  6. Turn the main body casting upside down and catch the accelerator pump discharge check ball and weight.
  7. Loosen the throttle shaft arm screw, and remove the arm and pump connector link.
  8. Remove the fast idle cam and shoulder scrw.
  9. Remove the accelerator pump diaphragm housing screws. Lift out the pump diaphragm assembly, the pump lifter link and the metering rod as a unit.
  10. Disengage the metering rod arm spring from the metering rod, and remove the metering rod from the metering rod arm assembly. Note the location of any washers shimming either spring for proper reassembly. Compress the upper pump spring, and remove the spring retainer. Remove the upper spring, the metering rod arm assembly, and the pump lifter link from the pump diaphragm shaft. Compress the pump diaphragm spring, and remove the pump diaphragm spring reatiner, spring, and pump diaphragm assembly from the pump diaphragm housing assembly.
  11. With the proper size screwdriver, remove the main metering rod jet and the low speed jet.
  12. Remove the throttle plate retaining screws. File the staked ends, if necessary, and use new screws upon assembly. Slide the throttle shaft and lever assembly out of the throttle body flange assembly. note the location of the ends of the torsion spring on the throttle shaft for proper reassembly. When removing the 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 stea tthe needle. This information will be used in 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