THE FUEL SYSTEM AND GOVERNOR
34
Governor
The engine speed is controlled by a balance
between the force applied by a spring (pulling the throt
-
tle open) and a flyweight mechanism within the engine
applying force to the governor arm (pushing the throttle
closed).
See Figure 4.22.
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
To remove the governor arm from the governor shaft:
1. Remove the fuel tank by following the steps
described in the Fuel Tank section of this chap
-
ter.
NOTE: Mark or note which holes the spring and
linkage was in to ensure they go back in the
same holes.
2. Unhook the governor spring.
3. Loosen the nut and clamp bolt. See Figure 4.23.
4. Carefully spread open the seam on the arm.
5. Carefully slide the Governor arm off of the gov-
ernor shaft.
6. Unhook the governor linage and throttle return
spring.
Figure 4.22
Spring tension
Governor action
Figure 4.23
Loosen nut
Spread here
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