Chapter 4: The Fuel System and Governor
41
To remove/replace the primer:
1. Remove the air filter housing by following the
steps described in Chapter 3: Air Intake And Fil-
ter.
2. Disconnect the primer line from the primer bulb.
See Figure 4.36.
3. Squeeze the two sets of tabs together and push
the primer out of the housing. See Figure 4.37.
4. Install the primer by following the above steps in
reverse order.
5. Test run the engine before returning to service.
Figure 4.36
Remove the
primer line
Figure 4.37
Squeeze the barbs together,
then push
Carburetors
Troubleshooting the carburetor is a process of elimina-
tion. If everything else on the engine checks out, the
carburetor is probably bad.
NOTE: It is important to perform a compression
or leak down test before condemning a carbure-
tor. An engine can have a borderline compres-
sion reading and not create enough of a vacuum
to draw in a sufficient fuel/air charge.
NOTE: If the engine has border-line compres-
sion, a quick test to see if that is the problem is
to remove the spark plug. Squirt a little bit of oil
into the combustion chamber to seal the rings.
Reinstall the spark plug. If the engine starts and
runs ok, then that was the problem. If it does not
start, move on to the carburetor.
Inspecting the carburetor:
1. Remove the float bowl and check for dirt and/or
varnish.
2. Inspect the needle valve and needle valve seat
for dirt and/or damage.
3. Inspect the gaskets and O-rings for damage.
4. Inspect the vents and orifices, verify that they
are free of debris.
NOTE: If a little cleaning and new gaskets will fix
the carburetor, do it. If the carburetor requires
extensive cleaning it is better to replace the car-
buretor.
IMPORTANT: Never try to mechanically clean
orifices. That will damage them and ruin the car-
buretor.
NOTE: The carburetors used on all vertical shaft
engines are similar in design, but differ in cali-
bration.
NOTE: The jet markings (if present) may be
used for identification purposes, but the techni-
cian should not attempt to infer orifice sizes from
the identification numbers.
NOTE: Installing the wrong main jet, or a carbu-
retor with the wrong main jet will produce perfor-
mance and emissions issues.
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