THE FUEL SYSTEM AND GOVERNOR
28
Choke
MTD snow engines are equipped with a choke and
a primer. Both must be used to start the engine. The
choke should be opened when the engine starts. This
can be a source of starting issues with customers who
are not familiar with manual chokes.
The choke is operated by a knob on the engine
shroud. If the choke plate fails to close fully, the engine
will be difficult or impossible to start when cold.
See Figure 4.7.
The choke rod is part of the heat box assembly
mounted on the front of the carburetor.
See Figure 4.8.
The choke rod can be bent slightly to facilitate
adjustment. To access it:
1. Remove the choke knob and the engine shroud
by following the steps described in Chapter 3:
Air Intake Systems.
2. Rotate the choke knob shaft to verify full choke
movement.
See Figure 4.9.
3. If the choke plate does not open fully or close
fully, adjust the choke linkage.
NOTE: When adjusting the choke linkage, make
small bends and recheck the movement of the
choke plate. Repeat this step until full movement
is achieved.
4. Reassemble by following step 1 in reverse order.
5. Test run the engine before returning to service.
Figure 4.7
Choke knob
Engine shroud
Figure 4.8
Heat box
Choke rod
Figure 4.9
Choke
plate
Choke
rod
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