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OPERATION
N° MA. 142-0
ic//usIin'
the
earburet,or
ADJUSTING
THE
IDLING
SPEED
To carry
out
this
adjustment. the following is needed
-
A
tachometer
- A device for checkinq
idling speed adjustments on the
carburettor
(
or
an approved gas analyser
-
A CDA 23
checking appartus
or
a workshop test bench
(
eguipment rnentioned
in
the
Equipment and
Repair
Materials list. or in the Tools and Eguipment notes
green
notes
NOTE WEBER
Carburettors ref.
N°
W 54-50,
55-50, 69-50, 74-50
fitted on
1977 models
onwards are fitted with a
fool-proof plug
(
white
)
on the
mixture screw.
To
adjust the
exhoust
emission,
this
pluq has to be removed, and
replaced..
alter adjustment, with a
«
Repair
»
plug
(
black
).
See Op MA. 142-000 for
removing and fitting the plug,
and the necessary tools.
ADJUSTMENT
CONDITIONS
1,
The idling speed adjustment must be
carried
out on an engine on which the rocker clearances and
the ignition
are
correctly set, with a dean air filter and with the engine in
good order.
2-
Check that the butterflies return
fully
to their
stops.
3. Do
not let
anything
except the ignition and the engine
cooling fan
(
or fans
)
impose
any bad on the alternator.
4. Run the engine to brinq the ou
teniperature
up
to
70
to 800
C
(
watt
for the electric cooling fan
(
or fans
)
to cut
in
1. M 20/616, M 22/617, M 23/623 ENGINES
iv/ich's el/ho;,!
/OcqIii' c'o?Ilec/t-r or dir coit di//on/og )
Op.
MA. 142-0 1
IMPORTANT It
is' nhso/,,tc'/v
/orhic/c/en
/0
ehange the
sr//ing of
.slop-seren- (
/
/ for the sveonri
elioke
hutto'rtiv.
oh/ch uds
h('('l/
nr//es/ed
/2\'
1/if'
in
rio
,,/clr't,,rer
ii/fP
jl
inierome/ei',
1.
Wait for the electric cooling fan
(
or fans
)
to cut
in.
2. Adjust
screw (3) controllinq the first choke butterfly opening until the
following result is
obtained
an idling
speed of 850 to 900 rpm.
3. Slowly ad just mixture screw
(2)
to obtain
the
following
result
1
.5
to 2.5
',
of CO
(iii's
dii
tho risc' ci cc'
dc/in
gs
cocrc'
5/Min
d to an
8.7
7,
or more of CO2 amhi
en! lem/iv
ra/are
of
15°
to
30" (].
4.
Adjust
screws (3) and
(2) so that
both the
idling
speed and
the guantity of
CO
and
CO
2
are
correct
-
Make
sure
that mixture
screw
(2) is adjusted
last
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