5.10
Section 5
Fuel System and Governor
4. Remove the throttle lever/shaft assembly with
foam dust seal.
Cleaning
WARNING: Flammable Solvents!
Carburetor cleaners and solvents are extremely flammable.
Keep sparks, flames, and other sources of ignition away
from the area. Follow the cleaner manufacturer’s warnings
and instructions on its proper and safe use. Never use
gasoline as a cleaning agent.
All parts should be cleaned thoroughly using a
carburetor cleaner (such as acetone). Make sure all
gum deposits are removed from the following areas:
• Carburetor body and bore; especially the areas
where the throttle plate, choke plate and shafts
are seated.
• Idle fuel and “off-idle” ports in carburetor bore,
power screw, bowl vent, and fuel inlet needle
and seat.
NOTE: These areas can be cleaned with a piece
of fine wire in addition to cleaners. Be
careful not to enlarge the ports, or break
the wire inside the ports. Blow out all
passages with compressed air.
• Float and float hinge.
• Fuel bowl.
• Throttle plate, choke plate, throttle shaft, and
choke shaft.
NOTE: Do not submerge the carburetor in cleaner or
solvent when fiber, rubber, or foam seals or
gaskets are installed. The cleaner may
damage these components.
Inspection
Carefully inspect all components and replace those
that are worn or damaged.
• Inspect the carburetor body for cracks, holes, and
other wear or damage.
• Inspect the float for cracks, holes, and missing or
damaged float tabs. Check the float hinge and
shaft for wear or damage.
• Inspect the fuel inlet needle and seat for wear or
damage.
• Inspect the tip of the low idle fuel adjusting
needle and power screw needle for wear or
grooves.
• Inspect the throttle and choke shaft and plate
assemblies for wear or excessive play.
Repair
Always use new gaskets when servicing or
reinstalling carburetors. Repair kits are available
which include new gaskets and other components.
Always refer to the Parts Manual for the engine being
serviced to ensure the correct repair kits and
replacement parts are ordered.
Reassembly
Throttle Shaft Installation
1. Install the foam dust seal on the throttle shaft.
2. Insert the throttle lever/shaft assembly into the
carburetor body. Position the cutout portion of
the shaft so it faces the carburetor mounting
flange.
3. Install the throttle plate to the throttle shaft. Make
sure the plate is positioned properly in the bore
as noted and marked during disassembly. Apply
Loctite
®
No. 609 to the threads of the throttle
plate retaining screws. Install the screws so they
are slightly loose.
Figure 5-12. Installing the Throttle Lever/Shaft.
Apply Pressure When
Tightening Screws
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