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 TM 10-3930-621-34
(3) Remove stop screws (4) attaching choke
d. Fuel Valve Seat and Needle. Always replace valve
plate to shaft (31) and remove plate.
seat and needle because both parts wear and may
(4) Slide shaft (31) from bowl and bracket.
cause incorrect float level.
(5) Press out washer (41) and retainer (27) from
e. Idle Adjusting Needle. Inspect point of needle.
shaft holes.
Must be smooth and free of ridges or score marks.
(6) Remove machine screw (32) from shaft. q.
f. Throttle and Choke Plates. Inspect plate for burrs
Remove plug (10) and drain disk (43) from fuel bowl.
or damaged edges. Never clean plates with a buffing
r. Remove bracket tube clip (30) from bracket (28) by
wheel or a sharp instrument.
removing screw (34) and nut (35).
g.
Throttle and Choke Shafts.
Check bearing
s. Remove bracket screw (29) from bracket (28) on
surfaces for wear.
boss of air intake and remove bracket.
h. Gaskets. Replace all gaskets and fibre washers
any time the carburetor is disassembled.
4-4. Cleaning and Inspection
i.
Check Specifications.
Check correctness of
a. General.
following jet sizes:
(1) Clean all parts with cleaning compound,
solvent (P-S-661). Dry thoroughly with compressed air.
Idle Jet........................ No.
11
(2) Blow out all passages in the air intake and
Fuel Valve .................. No.
35
fuel bowl casting. Be sure all carbon deposits have been
Main Jet...................... No.
19
removed from the throttle bore and idle discharge holes.
Discharge Jet ............. No.
50
It is advisable to reverse the flow of compressed air in all
Well Vent Jet .............. No.
23
passages to insure that all dirt has been removed.
Venturi........................ No.
16
Never use a wire or drill to clean out jets.
b. Float Assembly. Inspect top side of float lever for
j. Replacement. Replace only those parts available in
wear where it contacts fuel valve needle. Such wear can
the carburetor repair parts kit. Damage to any other
affect the float level.
parts will require replacement of the entire carburetor
c. Float Mounting Pin. Replace if any wear can be
assembly.
visually) detected on the bearing surface.
KEY to fig. 4-1:
1. Carburetor
19.
Valve w / seat
36.
Cotter pin
2. Stop lever
20.
Fuel bowl
37.
Retainer
3. Pin
21.
Jet
38.
Lever
4. Screw
22.
Washer
39.
Spring
5. Seal
23.
Plug
40.
Driver
6. Plate
24.
Washer
41.
Washer
7. Screw
25.
Screw
42.
Lever
8. Spring
26.
Plug
43.
Disk
9. Screw
27.
Retainer
44.
Plate
10. Plug
28.
Bracket
45.
Retainer
11. Jet
29.
Screw
46.
Screw
12. Washer
30.
Clip
47.
Jet
13. Float
31.
Shaft
48.
Body
14. Venturi
32.
Screw
49.
Shaft
15. Jet
33.
Spring
50.
Bolt
16. Gasket
34.
Screw
51.
Lock washer
17. Axle
35.
Nut
52.
Gasket
18. Washer
4-2
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