Cub Cadet MTD P71 Series - Manual (Page 49)

F UEL S YSTEM AND G OVERNOR
43
Autochoke
These engines are equipped with a temperature com-
pensating auto choke. The autochoke system 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 4.11.
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 4.12.
These engines also have a temperature compensator.
As the engine heats up, a bi-metallic spring expands,
rotating a rod towards the carburetor This rod will override
the autochoke, holding the choke open on hot restarts.
Figure 4.11
Choke
closed
Temperature
compensator
Figure 4.12
Choke
open
Air flow
Figure 4.13
Temperature
compensating rod
in the hot position