T65 Series Vertical Shaft Engines
42
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 4.10.
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 4.11.
The Autochoke System also has a temperature com-
pensator installed on the muffler. As the muffler heats up, a
bi-metallic coil inside will expand. The expanding coil will
rotate a lever towards the muffler, pulling on a rod. This rod
will override the autochoke, holding the choke open on hot
restarts. It will also keep the choke from fully closing until
the engine heats up.
Figure 4.10
Choke
closed
Air vane
Figure 4.11
Choke
open
Air flow
Figure 4.12
Temperature compensator
Choke Compensator rod
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