2. We clean the microswitch from dirt and wash it with white spirit.
3. By connecting an ohmmeter to the switch terminals, we measure the resistance.
With primary throttle closed, choke open and switch in correct position (see below "installation") its contacts are open. For a good switch, the resistance should tend to infinity. If the resistance is low, the switch is defective or incorrectly set.
4. Turn the throttle actuator lever with your finger. When the switch is working properly, its lever is pressed and the contacts close.
A good switch should have zero resistance.
Removing
A defective microswitch can be replaced without removing the carburetor from the vehicle. For clarity, the work is shown on the removed carburetor.
1. Disconnect the wire blocks from the microswitch terminals (see "Carburetor - removal and installation").
2. Using a slotted screwdriver, unscrew the two screws securing the microswitch to the bracket and remove the microswitch.
Installation
Set the microswitch with the carburetor choke open.
1. Install the switch on the bracket without tightening the screws. We turn the switch clockwise, thereby pressing its lever, until the switch operates. At the same time, his contacts will open. While holding the switch in this position, finally tighten the screws of its fastening.
2. Check the switch setting. When turning the throttle actuator lever B clockwise until its cutout stops in the antennae A, the microswitch should work (characteristic click).
3. Connect the wire blocks to the microswitch terminals (randomly).