Section 5 Fuel System and Governor 4 1. Governor Lever Hex Nut 2. Governor Cross Shaft 3. Governor Lever 4. Throttle Lever Linkage 5. Choke Linkage 6. Choke Actuating Lever 7. Governor Spring 8. Speed Control Bracket 9. Governor Lever (Holes for Sensitivity Adjustment) 8 5 1 2 3 6 9 7 Figure 5-8. Governor Controls and Linkage (External) (Air Cleaner Removed for Clarity). Adjustments Sensitivity Adjustment Governor sensitivity is adjusted by repositioning the governor spring in the holes on the governor lever. If speed surging occurs with a change in engine load, the governor is set too sensitive.
If a big drop in speed occurs when normal load is applied, the governor should be set for greater sensitivity. See Figure 5-8 and adjust as follows: General The governed speed setting is determined by the position of the throttle control. It can be variable or constant, depending on the engine application. Initial Adjustment NOTE: The LH760 and LH775 (EFI) engines require a special initial adjustment procedure, which is covered in subsection 5B. Refer to pages 5B.21-5B.22. 1. To increase the sensitivity, move the spring closer to the governor cross shaft. Make this adjustment whenever the governor lever is loosened or removed from the cross shaft. See Figure 5-8 and adjust as follows: 2.
To decrease the sensitivity, move the spring away from the governor cross shaft. High Speed RPM Adjustment (See Figure 5-9.) 1. With the engine running, move the throttle control to fast . Use a tachometer to check the RPM speed. 1. Make sure the throttle linkage is connected to the governor lever and the throttle lever on the carburetor. 2. Loosen the lock nut on the high speed adjusting screw. Turn screw outward to decrease, or inward to increase RPM speed. Check RPM with a tachometer. 2. Loosen the hex nut holding the governor lever to the cross shaft. 3. Move the governor lever towards the carburetor as far as it will move (wide open throttle) and hold in position. 3.
When the desired RPM speed is obtained, retighten the lock nut. 4. Insert a nail into the hole on the cross shaft and rotate the shaft counterclockwise as far as it will turn, then torque hex nut to 6.8 N·m (60 in. lb.) . NOTE: When the throttle and choke control cables are routed side-by-side, especially under a single clamp, there must be a small gap between the cables to prevent internal binding. After the high-speed setting has been complete, check that there is gap of at least 0.5 mm (0.020 in.) between the control cables. 5.12