Chapter 4: The Fuel System and Governor
43
• A square cross-section gasket seals the bowl to
the body of the carburetor.
6. Remove the main jet by using a narrow-shank
straight blade screwdriver. See Figure 4.42.
NOTE: A primer carburetor will have an addi-
tional port so that the air from the primer bulb
can enter the float chamber. See Figure 4.43.
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.
Figure 4.42
Main jet
Bowl gasket
Bowl vent port
Figure 4.43
Port for the
primer
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.
NOTE: The main jet secures the emulsion tube
in the central column of the carburetor.
See Figure 4.44.
7. 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 reach the plug.
See Figure 4.45.
Figure 4.44
Bowl vent ports
Emulsion air port: main jet
Emulsion air port: pilot jet
Emulsion tube
Main jet
Figure 4.45
Welch plug
Fuel feed leg
on central
column for pilot
and transition
shot plug in feed bore
Fuel port to
central column
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