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78/83/90 Series Horizontal Shaft Engines
50
Primers (snow engines)
MTD engines use a dry bulb primer. This means that there is no fuel in the primer bulb. The primer works by
pushing air into the float chamber of the carburetor when the primer bulb is depressed. This will force fuel to be
sprayed out of the main nozzle into the throat of the carburetor.
To test the primer:
1. Remove the engine shroud by following the steps described in Chapter 3: Air Intake Systems.
NOTE: Do not disconnect the primer hose.
2. Press the primer bulb while looking down the carburetor throat. If there is fuel squirting into the carburetor
throat, the primer is working properly. If not, replace the primer and hose.
NOTE: The primer and primer hose come as an assembly so there is no need to determine which part is bad.
To replace the primer:
3. If the primer is bad, disconnect hose from the carbu-
retor.
4. Remove the hose camp at the rear of the primer
bulb.
See Figure 4.24.
5. The primer is held to the shroud by a pair of split,
barbed posts. Squeeze the posts to release the
barbs.
See Figure 4.24.
NOTE: The primer bulb and hose will slide out as an
assembly.
6. Install the new primer by following the above steps
in reverse order.
Figure 4.24
Clamp
Barbed posts
For Parts Call 606-678-9623 or 606-561-4983
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