Chapter 4: The Fuel System and Governor
46
Governor
The engine speed is controlled by a balance between
the force applied by a spring (pulling the throttle open)
and a flyweight mechanism within the engine applying
f o r c e t o t h e g o v e r n o r a r m ( p u s h i n g t h e t h r o t t l e c l o s e d ) .
See Figure 4.53.
NOTE: While the mechanism is simple and
robust, it is important to pay attention when
working on parts near the governor. Binding
caused by interference with mis-routed lines or
cables may make the governor unresponsive.
NOTE: When a governed engine “hunts”, it is
generally an indication of a lean fuel/air mixture,
rather than a problem with the governor.
Governor arm
1. To remove the governor arm from the governor
shaft:
1a. Unhook the governor spring.
1b. Unhook the governor linage.
1c. loosen the nut and through bolt.
See Figure 1.3.
NOTE: The governor shaft is splined. If it is nec-
essary to remove the governor arm, make an
index mark to orient the shaft to the arm on
installation and go to step 3.
1d. Carefully slide the Governor arm off of the
governor shaft.
2. If the governor arm is being installed without
benefit of index marks:
2a. Rotate the governor shaft clockwise as far
as it will go.
2b. Position the top of the arm about 3/16”
(.476cm) from the boss on the casting that
provides a mounting point for the fuel tank
bracket.
Figure 4.53
Spring tension
Governor action
Figure 1.3
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