MTD Engine - Series 350/450/650
30
10. GOVERNOR
10.1. 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 10.1.
10.2. While the mechanism is simple and robust, it is
important to pay attention when working on parts
near the governor. Binding caused by interfer-
ence with mis-routed lines or cables may make
the governor unresponsive.
10.3. The governor arm may be removed from the
governor shaft using a 10mm wrench.
See Figure 10.3.
10.4. The governor shaft is splined. If it is necessary to
remove the governor arm, make an index mark
to orient the shaft to the arm on installation.
10.5. If the governor arm is being installed without
benefit of index marks:
• Rotate the governor shaft clockwise as far as it
will go.
• 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.
• Slide the arm onto the shaft. The flat on the top
of the shaft should be roughly perpendicular to
the shaft.
• Tighten the nut on the clamp bolt to secure the
arm.
10.6. Adjust the governor to maintain top no-load
speed as described in the MANTENANCE AND
ADJUSTMENT section of this manual, Instruc-
tion number 5.6 and 5.7.
NOTE: When a governed engine “hunts”, it is
generally an indication of a lean fuel/air mixture,
rather than a problem with the governor.
Figure 10.1
Spring tension
Governor action
Figure 10.3
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