Cleaning and Inspection - Carburetor
1. Obtain Carburetor Cleaner.
NOTE: Remove and set aside all rubber parts or those
that have rubber components, such as the needle valve,
O-rings, and fuel hose, as these can be damaged by the
carburetor cleaner.
2. Inspect carburetor body and float bowl for sediment, gum
or varnish deposits. Spray parts and then wipe away
cleaning solution with a clean cloth. Repeat step until
clean cloth shows no evidence of dirt or debris.
3. Inspect carburetor body and float bowl for cracks or
other damage. Replace carburetor if either condition is
observed.
4. Locate each fuel and air passageway in the carburetor
body. Look for the brass or bronze beads in the
casting, which point out where the cross drillings of the
passageways are located.
5. Spray carburetor cleaner into the entrance of each
passageway and look for the solution to exit from one or
more passageways.
6. Use carburetor cleaner and compressed air to ensure
that each passageway is clean and open.
NOTE: Avoid use of wires or pointed tools as they can
scratch or damage surfaces, enlarge holes, and push grit
and dirt deeper into carburetor.
7. Look through the main jet while holding it up to the
light. The hole should appear round and unobstructed.
Thoroughly clean with carburetor cleaner and
compressed air.
8. Hold main jet assembly up to the light to verify
cleanliness. Verify that all orifices are clean and open.
9. Check main jet passageway for discoloration, dirt,
and debris. Clean passageway with a soft bristle gum
cleaning brush.
10. Use compressed air to clean atmospheric vent holes and
air/fuel jets embedded in the carburetor body.
11. Inspect the needle valve and seat. Check tip of needle
valve for wear or grooves. Replace parts as necessary.
12. Inspect float for distortion, dents, cracks, or holes.
Submerge float in a glass of water to verify that it is
water tight. Replace float if damaged or if it cannot be
adequately cleaned.
13. Spray choke shaft and valveand then wipe using a clean
cloth. Inspect for damage or wear.
14. Spray throttle shaft and valveand then wipe using a
clean cloth. Inspect for damage or wear.
15. Thoroughly dry all parts with compressed air.
Assembly - Carburetor Vanguard Model 540000
1. Install new seals onto the throttle shaft (K, Figure 145).
Install throttle shaft into the carburetor body.
2. Install the throttle shaft washer and circlip to secure the
throttle shaft to the carburetor.
3. Apply LOCTITE 222, or equivalent, on throttle plate
fastener threads. Install one throttle plate (J) at a time.
Check throttle for freedom of operation before installing
the other throttle plate. Tighten throttle plate fasteners
until snug.
4. Install carburetor cover plate (F) with new gasket.
Tighten fasteners until snug.
5. Install the nozzle body (I) with new gasket into the
carburetor. Install the nozzle fastener and tighten until
snug.
6. Install new choke shaft seal onto the choke shaft (H).
Install choke shaft into the carburetor body.
7. Install the choke shaft washer and circlip to secure the
choke shaft to thecarburetor.
8. Apply LOCTITE 222, or equivalent, on choke plate
fastener threads.Install the choke plate (G) onto the
choke shaft. Install fasteners and tighten until snug.
9. Install the emulsion tube body (E) with new gasket.
Install the fastener and tighten until snug.
10. Assemble the needle to the float (D) and install the float
onto the carburetor securing it with the hinge pin.
11. Install the anti-afterfire solenoid (C) with new gasket ring
into the float bowl (B). Using a thin profile wrench tighten
the solenoid until snug.
NOTE: DO NOT overtighten the anti-afterfire solenoid.
Damage to the main jet and float bowl may occur.
12. Install the float bowl with new o-ring onto the carburetor.
Install the 2 float bowl fasteners and tighten until snug.
Assembly - Carburetor - Vanguard Model 610000
1. Install new seal and bushings onto throttle shaft (J,
Figure 146).Install throttle shaft into carburetor body.
2. Install the throttle shaft washer and circlip to secure the
throttle shaft to the carburetor.
3. Apply LOCTITE 222, or equivalent, on throttle plate
fastener threads. Install one throttle plate (I) at a time.
Check throttle for freedom of operation before installing
the other throttle plate. Tighten throttle plate fasteners
until snug.
4. Installbushings onto choke shaft (H). Install choke shaft
into carburetor body.
5. Install the choke shaft washer and circlip to secure the
choke shaft to thecarburetor.
6. Apply LOCTITE 222, or equivalent, on choke plate
fastener threads.Install the choke plate (G) onto the
choke shaft. Install fasteners and tighten until snug.
7. Install the mixture adjustment screws and limiter caps (F)
into the carburetor body.
8. Assemble the needle to the float (E) and install the float
onto the carburetor securing it with the hinge pin.
9. Install the main jets (D) into the float bowl (B).
10. Install new float bowl gasket onto the carburetor body.
116 vanguardpower.com
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