5.11
Section 5
Fuel System and Governor
5
6. Clean the carburetor body, main jets, vent ports,
seats, etc., using a good commercially available
carburetor solvent. Keep away from plastic or
rubber parts if non-compatible. Use clean, dry
compressed air to blow out the internal channels
and ports. Do not use metal tools or wire to clean
orifices and jets. Inspect and thoroughly check
the carburetor for cracks, wear, or damage.
Inspect the fuel inlet seat for wear or damage.
Check the spring loaded choke plate to make sure
it moves freely on the shaft.
7. Clean the carburetor fuel bowl as required.
8. Install the two main nozzles into the towers of
the carburetor body. The end of the main nozzles
with the two raised shoulders should be out/
down (adjacent to the main jets). Make sure the
nozzles are completely bottomed. Carefully
install the main jets into the towers of the
carburetor body on the appropriate side, as
identified when removal was performed. See
Figure 5-23.
Figure 5-24. Installing Idle Speed Adjusting Screw
and Spring.
12. Attach the inlet needle to the plastic tang of the
float with the wire clip. The formed 90° lip
should point up, with the needle valve hanging
down. See Figure 5-25.
Nozzle End with
Two Shoulders
(Out/Down)
Main
Jets
Idle Speed
Screw and
Spring
Inlet Needle
Float
Clip
Figure 5-23. Installing Main Nozzles and Main Jets.
9. Make sure the O-Ring near the bottom of each
slow jet is new, or in good condition. Align and
insert the two slow jets into the top of the
carburetor. See Figure 5-22.
10. Install the large flat retaining washer and secure
with the mounting screw, attaching the ground
lead if originally secured by the screw.
11. Install the new idle speed (RPM) adjustment
screw and spring onto the carburetor. Thread in
until 3 or 4 threads are exposed, as an initial
adjustment. See Figure 5-24.
Figure 5-25. Float and Inlet Needle Details.
13. Install the float and inlet needle down into the
seat and carburetor body. Install the new pivot
pin through the float hinge and secure with the
new retaining screw. See Figure 5-26.
Figure 5-26. Installing Float Assembly.
