5.12
Section 5
Fuel System and Governor
Figure 5-8. Governor Controls and Linkage (External) (Air Cleaner Removed for Clarity).
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)
Adjustments
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 (EFI) engines require a special
initial adjustment procedure, which is covered
in subsection 5B. Refer to pages 5B.21-5B.22
Make this adjustment whenever the governor lever is
loosened or removed from the cross shaft. See
Figure 5-8 and adjust as follows:
1. Make sure the throttle linkage is connected to the
governor lever and the throttle lever on the
carburetor.
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.
4. Insert a nail into the hole on the cross shaft and
rotate the shaft counterclockwise as far as it will
turn, then tighten hex. nut securely.
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 5-9
and adjust as follows:
1. To increase the sensitivity, move the spring closer
to the governor cross shaft.
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.
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.
3. When the desired RPM speed is obtained,
retighten the lock nut.
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.
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