Fast Idle Speed

Fig. 2 Automatic choke fast idle adjustment.:

Fig. 3 Automatic choke fast idle adjustment.:

On fuel injected engines, fast idle speed is controlled by the fast idle valve and no adjustment is provided. Adjust fast idle speed on carbureted engines using the following procedure.
1. Run engine until it reaches normal operating temperature and cooling fan cycles, then stop engine.
2. Connect tachometer, then disconnect and plug inside hose from fast idle unloader.
3. Hold choke valve closed, then open and close throttle to engage fast idle cam.
4. Start engine and run for one minute, then check fast idle. Fast idle speed should be as specified. If necessary, adjust by turning fast idle screw, Figs. 2 and 3.




On fuel injected engines, fast idle speed is controlled by the fast idle valve and no adjustment is provided. Adjust fast idle speed on carbureted engines using the following procedures.

Fig. 4 Disconnecting thermowax linkage.:

Fig. 5 Aligning fast idle lever.:

Fig. 6 Automatic choke fast idle adjustment.:

1. Start engine and allow to reach normal operating temperature, then stop engine and connect suitable tachometer.
2. Remove E-clip and flat washer from thermowax linkage, then slide out linkage until its tab is clear of the fast idle cam, Fig. 4. Use care not to bend linkage or fast idle speed will be changed.
3. Hold throttle open and turn fast idle cam counterclockwise until fast idle lever is aligned as shown in Fig. 5.
4. Start engine without opening the throttle, then check idle speed.
5. If fast idle speed is not within specifications, adjust by turning fast idle screw, Fig. 6.