DISASSEMBLY

1. Remove the solenoid throttle positioner and bracket.

2. Remove the thermostatic choke housing retainer screws, retainers, housing, and gasket.

   Remove the choke piston lever screw and choke piston lever, piston and wire link.

3. Remove the air cleaner retainer screw bracket. Remove the fork lever from the choke plate shaft, then remove the choke plate screws and plate. It may be necessary to file the staked ends of the screws prior to their removal. Slide the shaft out of the main body.

4. Remove the fast idle cam screw and remove the cam. Disengage the fast idle connector rod from the cam and fork lever on the choke plate shaft.

5. Remove the accelerator pump arm connecter link and link clip.

6. Remove the accelerator pump arm retainer screw and retainer, then remove the pump arm. Remove the mechanical fuel bowl vent cover and link (if equipped).

7. Remove the fuel bowl attaching screws, bowl and gasket.

8. Remove the float pin attaching screws, float, pin, and fuel inlet needle valve and seat assembly from the body casting.

9. Remove the jet. Remove the accelerator pump assembly. Use a light hammer and tap on the upper end of the pump plunger shaft after removing the snap ring from the shaft. The accelerator pump cover, plunger, and spring will drop from the lower end of the casting.

10. Remove the step-up metering rod and diaphragm assembly by prying the conical washer out of the diaphragm cover with a screwdriver. Pierce the cover with a sharp pointed tool, and pry the cover from the casting.

11. Remove the diaphragm retainer, spring, diaphragm, and step-up metering rod assembly.

12. It is necessary to remove the throttle plate or shaft and lever assembly, lightly scribe the throttle plate and the bottom of the mounting flange to facilitate installation. Remove the throttle plate screws. If the tips of the screws are flared excessively, file the flared portion to avoid damage to the threads in the throttle shaft. Avoid damage to the throttle shaft or bore while filing the screws.

    Remove the throttle plate, then slide the throttle shaft and lever assemby out of the main body. Note the location of the ends of the torsion spring on the throttle shaft for proper reassembly.

13. 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 seat the needle. This information will be used in reassembly. Remove the idle mixture screw and spring, fast idle speed adjusting screw and spring, and the idle speed adjusting screw and spring. Do not attempt to remove the slotted idle passage plug located below the idle limiter. It is pressed-in at assembly, and any position change will affect the idle quality.

ASSEMBLY

1. Invert the main body casting, then place the accelerator pump plunger with the spring, spring seat, and shims in the pump housing. Press the pump cover assembly into the end of the housing. A new cover assembly should be used to provide a good seal. Use 5/8” socket to press on the outer edge of the cover and, using a light hammer, tap the cover until it seats in the main body casting. Do not exert force on the center portion of the pump cover.
2. Install the idle jet in the main body.
3. With the main body upright, insert the step-up metering rod halfway into the sleeve in the casting, then drop in place in the main body. Position the diaphragm spring and retainer cover; using a 1/2” socket. Tap with a light hammer until the diaphragm cover seats in the main body.
4. Install a new conical washer over the diaphragm cover and using a 7/16” socket, tap with a light hammer until the washer is flat in the main body.