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Solex 32 and 34 PBISA
adjustments
Idle speed and mixture
16 Refer to Chapter 1.
Fast idle setting
17 To adjust this accurately it will be
necessary to measure the angular movement
of the throttle valve. The use of a piece of card
with the angle drawn on it will provide the
necessary setting.
18 Fully close the choke valve then check that
the throttle valve has opened by 20° 40’ ± 30’.
19 If necessary turn the fast idle adjustment
screw as required.
Solex 35 PBISA 8 adjustments
Idle speed and mixture
20 Refer to Chapter 1.
Initial throttle opening
21 To adjust the initial throttle valve opening,
fully unscrew the adjustment screw then,
using a piece of card as described in
paragraph 17, turn the screw until the valve is
opened by 7° 45’.
Fast idle setting
22 The fast idle setting is only made on the
left-hand carburettor with the reference
number 346. First close the choke valve then
check that the throttle valve has opened by
15º. If not, turn the adjustment screw as
required.
Choke opening after starting
23 To adjust the choke opening after starting,
first close the choke then pull the vacuum
opener rod and, using a suitable twist drill,
check that the gap between the bottom edge
of the throttle valve and the carburettor wall is
2.5 ± 0.3 mm. If not, turn the nut on the end of
the vacuum opener as required.
Solex 32 PBISA 16 adjustments
Idle speed and mixture
24 Refer to Chapter 1.
Fast idle setting
25 With the carburettor removed, invert it
then pull the choke lever fully on.
26 Using a twist drill, check that the gap
between the throttle valve and barrel is 0.8
mm. If not, turn the adjustment screw.
Choke opening after starting
27 Close the choke flap, then fully operate
the pneumatic opener either manually or by
vacuum.
28 Using a twist drill, check that the gap
between the choke flap and barrel is 3.0 mm.
If not, turn the adjusting screw in the end of
the opener.
Throttle damper
29 Certain models may have a throttle
damper assembly, fitted to the carburettor on
a modified throttle cable support bracket, to
prevent engine stalling during gearchanges.
30 The assembly should not require any
adjustment, but if the throttle is held open by
the damper excessively during gearchanges,
adjustment can be made by loosening the
locknut, and altering the position of the
damper in the bracket as necessary. Tighten
the locknut on completion of adjustment.
Solex 32-34 Z2 adjustments
Idle speed and mixture
31 Refer to Chapter 1.
Additional adjustments
32 At the time of writing, not further
information was available relating to any
further adjustment of these carburettors.
Weber 35 IBSH adjustments
Idle speed and mixture
33 Refer to Chapter 1.
Float level
34 Hold the cover vertical with the float arm
touching, but not depressing, the
spring-tensioned ball on the needle valve.
35 Using vernier calipers, measure the
dimension between the float and the fitted
gasket (see illustration). If it is not 9.0 mm,
bend the tongue on the arm as necessary.
Throttle normal idling position
36 This adjustment is made after overhauling
the carburettors, and is necessary to enable
the engine to be started and to prevent the
throttle valve sticking in the closed position.
The idle speed screw must be adjusted to set
the throttle valve 6° open, using a piece of
card as described in paragraph 17.
Fast idle setting
37 With the choke fully closed, the throttle
valve should be open by 14°. Adjust the fast
idle screw on the throttle lever to achieve the
desired setting (see illustration).
Fuel system - carburettor engines 4A•7
4A
10.35 Checking float level dimension “X”
on the Weber 35 IBSH carburettor
1 Gasket
a Adjustment tongue
10.37 Fast idle adjustment on the
Weber 35 IBSH carburettor
1 Fast idle screw