Chapter 4: The Fuel System and Governor
38
Manual Choke
If the engine is equipped with a manual choke, the
choke must be closed to start the engine and opened
when the engine starts. This can be a source of starting
issues with customers who are not familiar with manual
chokes.
The manual choke is operated by a pull knob at the
carburetor or on the handle bar, depending on the
application. If the choke plate fails to close fully when
the knob is pulled, the mower will be difficult or impos-
sible to start when cold.
NOTE: The rod connecting the choke lever to
the choke arm on the carburetor can be bent
slightly to facilitate adjustment. See Figure 4.25.
Autochoke
The MTD engine uses a simple autochoke system that
is similar to the old style air vane governors. When the
engine is at rest a spring holds the choke in the closed
position. See Figure 4.26.
When the engine starts, the air flow from the flywheel
fan pushes on an air vane. the air vane in turn moves
the choke lever, opening the choke. See Figure 4.27.
Figure 4.25
Choke rod
Figure 4.26
Choke
closed
Figure 4.27
Choke
open
Air flow
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