Carburetor 81
So]ex 4Al duplex t`Aro-stage carburetor
1 Carburetor cover
2 Throttle butterfly
3 Choke butterfly
4 Thermal cold-start mixture bypass
starter
5 Fuel feed
6 Carburetor body
7 Pull-down
s Automatic choke
9 Accelerator pump lever
10 ldle speed shutoff valve
11 Throttle lever stop screw
12 Throttle butterfly damper
13 Heat-sensitive timer valve
14 Throttle lever, stage 1
15 Throttle lever, stage 2
16 Throttle butterfly section
The Solex Type 4Al carburetor is a
duplex two-stage instrument with barrel
diameters of 2X32 mm for stage 1 and
2X54 mm for stage 2. lt is equipped with
a starting and warm-up system made up
of a combined automatic choke (with
electric and coolant heating), a thermo-
stat-controlled bypass starting system
and a vacuum-controlled speed regula-
tor. Carburetor and automatic choke
need no maintenanee.
Adjustment work on carburetors and
fuel injection system§
All mixture preparation systems have
been set up on the test bench in accord-
ance with the ECE R 15 Type 11 exhaust
emission control regulations and other
relevant legislation, and sealed to pre--
vent unauthorized tampering with the
settings.
Any adjustment work which becomes
necessary must be performed only by a
BMW Service Station, since only these
possess the necessary measuring equip-
ment, up-to-date adjustment data and
factory instructions.
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