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CARBURETOR-BBS
14-1 5
CARBURETOR MODEL
ACCELERATOR PUMP
IDENTIFICATION TAG
ROCKER ARM
(DO NOT REMOVE)
BOWL VENT VALVE
VACUUM HOSE
THROllLE BODY
EED ADJUSTING
SCREW
(CURB IDLE)
SCREW
NK642
VENT TUBE FIllING
ADJUSTING SCREW
Fig. 2-Carburetor
Assembly IBBS-3839S, BBS-3840s and 5-3841
S
Typical of BBS-3837s and BBS-3838s
SERVICE PROCEDURES
DISASSEMBLY
To disassemble the carburetor for cleaning or over-
haul, refer to (Figs.
1
or
2),
and proceed as follows:
(1) Place the carburetor assembly on repair block,
(2)
Remove hairpin clip and disengage the acceler-
ator pump operating rod.
(3) Remove the vacuum hose between the carbu-
retor main body and the vacuum diaphragm.
(4)
Remove the clip from the choke operating link
and disengage the link from the diaphragm plunger
(stem) and the choke lever. Refer to (Fig.
1).
( 5 )
Remove the vacuum diaphragm and bracket as-
sembly and place to one side to be cleaned as a spe-
cial item. A liquid cleaner may damage the diaphragm
material.
To01
C-3225.
(6) Remove the air horn retaining screws.
(7)
Tilt the air horn toward the throttle lever far
enough to disengage the fast idle cam link from the
fast idle cam, as shown in (Fig. 3). Lift air horn up
and away from main body. Discard the gasket.
( 8 )
Disengage the accelerator pump plunger from
the rocker arm, by pushing up on the bottom of
plunger and sliding plunger shaft
off
hook. Slide
plunger out of air horn and remove bowl vent valve,
spring seat and spring. If the old plunger can be used
ACCELERATOR
R
FAST IDLE CAM'
b
,e
64
x
267
Fig. 3-Removing
or installing Air Horn
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