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14-1 4
CARBURETOR-BBS
PART 3
BBS SERIES CARBURETOR
Description
The BBS series carburetor is a single throat down-
draft carburetor.
The BBS-3833s and the BBS-3834s carburetors
used on the 170 cu. in. engine are equipped with a
spring staged choke, as shown in (Fig. 1). The BBS-
3835s and the BBS-3836s carburetors are used on the
170 cubic inch engine when equipped with air con-
ditioning and the cable control throttle linkage.
The BBS-3839s and the BBS-3840s carburetors
used on the 225 cu. in. engine are equipped with the
conventional choke mechanism, but have the cable
control throttle lever, as shown in (Fig. 2).
The BBS-3841s carburetor on the 170/225 cu. in. en-
gine (taxi application) and the BBS-3837s and the
BBS-3838s used on the 225 cu.
in.
engine (High Per-
formance with manual and automatic transmissions),
the BBS-3839 and BBS-3840s carburetors used when
equipped with air conditioning are serviced the same
as the previously mentioned BBS carburetors.
Since the service procedures are identical on all
BBS carburetors, the illustrations showing the various
disassembly procedures will not always show any one
specific carburetor.
The spring staged choke, shown in (Fig. 1)
is
a de-
vice incorporated in the choke mechanism which lim-
its the choke blade closing torque when cranking the
engine at temperatures below zero. Thus the spring
staging of the choke is a better match for the engine's
starting mixture requirements at the low tempera-
tures.
CARBURETOR MODEL
SPRING STAGED CHOKE
IDENTIFICATION TAG
ACCELERATOR PUMP
PLUNGER STEM
BOWL VENT VALVE
CHOKE OPERATING
CRANKCASE VENT
TUBE FITTING
FUEL INLET NEEDLE
SEAT AND GASKET
\
IDLE SPEED-ADJUSTING
SCREW (CURB IDLE)
CLOSED CRANKCASE
FAST IDLE/
VENT TUBE FITTING
SPEED ADJUSTING
SCREW
\
IDLE MIXTURE
ADJUSTING SCREW
NK64l
Fig. 1 - - C ~ r ~ w e i o r Assernhlv (885-38335 and BBS-3834S, Typical of BBS-3835s and BBS-38369
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