MTD Engine - Series 350/450/650
27
8.29. A square cross-section gasket seals the bowl to
the body of the carburetor.
8.30. A narrow-shank straight blade screwdriver can
be used to remove the main jet. See Figure 8.30.
NOTE: Fuel enters the central column through a
port about 1/2” (1cm) from the bottom, to help
prevent the ingress of any residue in the bottom
of the bowl.
NOTE: The orifice in the main jet meters fuel into
the central column.
NOTE: Air from the main jet emulsion port
enters the central column near the top, then gets
bubbled through the emulsion tube into the
metered fuel flow to promote atomization.
8.31. The main jet secures the emulsion tube in the
central column of the carburetor.
See Figure 8.31.
Figure 8.30
Main jet
Bowl gasket
Bowl vent port
Figure 8.31
Bowl vent ports
Emulsion air port: main jet
Emulsion air port: pilot jet
Emulsion tube
Main jet
8.32. The throttle stop screw has a large pliable lip
around the head of the screw. That lip secures a
metering plug for the pilot and transition ports.
Remove the screw to remove reach the plug.
See Figure 8.32.
8.33. The metering plug can be carefully pried out
using a small screwdriver. See Figure 8.33.
Figure 8.32
Welch plug
Fuel feed leg
on central
column for pilot
and transition
shot plug in feed bore
Fuel port to
central column
Figure 8.33
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