Cub Cadet MTD P71 Series - Manual (Page 54)

P71 Series Vertical Shaft Engines
48
15. Adjust the top no-load speed by slightly bending the
bracket that the governor spring connects to. The
bracket is visible under the air filter. See Figure
4.23.
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 force to
the governor arm (pushing the throttle closed). See Figure
4.24.
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 unrespon-
sive.
NOTE: When a governed engine “hunts”, it is gen-
erally an indication of a lean fuel/air mixture,
rather than a problem with the governor.
Figure 4.23
Increase spring tension to
increase engine speed
Bracket
Governor spring
Figure 4.24
Governor arm
Governor spring
Spring bracket