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TM 10-3930-653-14&P
(3) Withdraw choke valve shaft.
(4) Remove choke shaft collar, choke shaft arm spring,
choke lever ring, choke lever assembly and choke lever
return spring, in turn.
(3) FLANGE
(1) Remove idle adjusting screw together with spring.
(2) Remove slow port plug.
(3) Releasing throttle valve set screw, remove throttle
valve.
(4) CLEANING
Disassembled components should be cleaned in P-D-
680. Clean hollow parts, such as fuel passage, of dirt by
blowing out with compressed air. Do not use metal such
as a piece of wire to clean the fine holes of jets.
WARNING
Dry cleaning solvent P-D-680 is toxic
and flammable. Wear protective
goggles and gloves and use only in a
well ventilated area. Avoid contact
with skin, eyes, and clothes and don’t
breathe vapors. Do not use near
open flame or excessive heat. If you
become dizzy while cleaning with
solvent, get fresh air immediately and
get medical aid. If contact with skin
or clothing is made, flush with water.
If contact with eyes is made, wash
your eyes with water and get medical
aid immediately. Compressed air
used for cleaning purposes will not
exceed 30 PSI. Use only with
effective chip guarding and personal
protective equipment (goggles/shield,
gloves, etc.).
(5) INSPECTING
(1) Inspect float valve and seat contacting face.
Replace if necessary.
(2) Check filter for clog and deformation.
(3) Check jets and air bleeds for clog and looseness.
(4) Check idle adjusting screw and seat contacting part
for damage.
(5) Check throttle valve shaft for wear.
(6) Inspect for smooth movement of linkage parts.
(7) Fill float chamber with gasoline and inspect injecting
condition of gasoline from accelerating nozzle, by moving
throttle lever.
(8) Depress diaphragm connecting rod of diaphragm
chamber assembly and block up vacuum passage with a
finger.
Then
release
the
rod
and
check
the
circumference of diaphragm and for leaks.
4-5-4-3. ASSEMBLY
When assembling the carburetor, gaskets and packings
should be replaced with new ones.
(1) CARBURETOR ASSEMBLY
Assembly is carried out by reversing the disassembly
procedure. Choke linked opening and primary and
secondary linked opening should be adjusted. (See 5-4-
4 "Adjustment".)
(2) AIR HORN
Assembling
the
air
horn
is
a
reversal
of
the
disassembling procedure. Install and secure the choke
valve tightly after adjusting the position and direction of
the valve so that it is fully closed. Apply Loc-Tite® to set
screws to keep them from coming loose.
(3) FLANGE
Assemble flange by reversing the disassembling
operations. When installing the primary and secondary
valves, adjust them so that they are fully closed, and in
the same manner as in the choke valve, tighten set
screws after applying bonding agent to the screws.
Adjust idle adjusting screw and throttle adjusting screw.
4-5-4-4 ADJUSTMENT
(1) ADJUSTMENT OF STARTING
INTERLOCK VALVE OPENING
Adjustment should be performed with choke valve fully
closed. Without disturbing above setting, check to
determine if opening angle of primary throttle valve is
specified value.
Primary throttle valve opening angle:
18.5°
If necessary, bend choke connecting rod
as
required.
4-69
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