Main Diaphragm Assembly
Disconnect the negative battery terminal, hoses from the air cleaner and remove the air box.
Disconnect the diaphragm assembly vacuum tubes.
Using a suitable pin with a thin cylindrical end, knock out a round pin (axis of rotation) fastening the diaphragm assembly to the top cover of the carburetor.
Mark the position of the body marks, bimetallic. springs to make installation easier later on, then remove the three screws and lift up the spring housing. Slide it to the side, being careful not to strain the hoses or the choke heater wiring harness.
Remove the three screws securing the choke assembly to the carburetor body. Let the choke assembly hang down, but do not disconnect the choke linkage.
Remove the star clip of the diaphragm assembly to the carburetor cap and pull out the diaphragm assembly.
Installation is carried out in the reverse order of removal, however, it is necessary to install a new star-shaped clamp securing the diaphragm to the top cover of the carburetor. Before installing the air box on top of the carburetor, check and, if necessary, adjust the choke opening as indicated in this section.
Solenoid for slightly opening the air damper in the secondary chamber
The solenoid works in conjunction with the carburetor's primary chamber diaphragm.
Disconnect the negative battery terminal, air cleaner hoses and remove the air box.
Disconnect the vacuum tube of the diaphragm device.
Disconnect the wiring, then remove the screw and separate the solenoid and its bracket from the carburetor. Remember that the screw also secures the ground wire.
Installation is carried out in the reverse order of removal. Check that the ground wire is in place with the solenoid bracket screw.
Adjustment of the vacuum device for opening the air flap
After removing the air box from the top of the carburetor, the procedure is as follows.
Note the position of the marks on the bimetal spring body, then remove the three screws and lift the spring body. Move it to the side, being careful not to strain the cooling hoses and the air damper heater wiring.
Set the fast idle adjustment screw to the highest cam step and check that the choke is closed.
Move the lever to the diaphragm device by pressing the adjusting screw until it stops. Keep the lever in this position.
With a drill shank of the appropriate diameter, or a similar tool. Measure the gap between the underside of the damper and the diffuser wall of the primary chamber. It must correspond to that specified in the specification in the column "small gap" ("Carburetor settings. Air damper gap").
If adjustment is necessary, turn the adjusting screw in the appropriate direction with a socket wrench.
Now push the opening lever towards the diaphragm device as far as it will go and hold it in this position.
As above, measure the gap between the underside of the air damper and the diffuser wall of the primary chamber. It must correspond to that specified in the specification in the column "big gap".
If adjustment is necessary, turn the adjusting screw in the appropriate direction.
Connect the bimetal spring to the choke lever, install its body on the choke housing and "make money" fixing screws. Align the marks on the spring housing and damper housing, then tighten the screws.
Install the airbox on top of the carburetor after adjustment is complete.
Visitor comments