Throttle Full Close Switch: Testing and Inspection

Fig. 5 Idle micro switch test connections:

Fig. 6 Throttle plate clearance adjustment:

Fig. 7 Idle micro switch adjustment:

1. Remove air cleaner and carburetor.
2. Rotate fast idle cam counterclockwise, then install a suitable pin through holes in cam and bracket to lock cam in position.
3. Connect ohmmeter to terminals of idle micro switch as shown in Fig. 5. When throttle valve is in idle position, ohmmeter should indicate zero ohms.
4. Open throttle valve 1/4 to 1/2 as shown in Fig. 6. Ohmmeter should read infinity. If not, replace idle micro switch.
5. Open throttle valve slowly till throttle valve to carburetor bore clearance is .014-.024 inch (9.36-.62 mm), Fig. 6. and ohmmeter reading moves from zero to infinity.
6. If ohmmeter reading is not as specified, adjust by bending lever Fig. 7. Bend lever down when clearance is below specification and up when over specification.