I }.IOTE:
Generally, the
main
regulating
system
utilizes main- and
needle
jets
ofvarious sizes, and
needles,
plungers
and springs ofdifferent
tlPes.
Between main
jet
(7)
and nozzlestock
(5)
a
washer
(6)
is
provided
which, together
with the float
chamber,
forms
an
annular
gap.
In
particularly
severe operating
conditions
this
ensures
that
the fuel
is
not spun away
from the main
jet.
A rubberring
(4)
seals the
nozzle
stock
(5)
off
from the carburetorhousing to avoid
any
fuel
being
drawn
in via
the thread
and thus bypassing the
main
jet.
7.15.5)
Idling
system
During
idling and low-loadrunning
the throttle
valve
(41)
is closed
to such an extent
that thc air
flow
underneath thc
plunger
(19)
no longer forms
a sufficient vacuum.
The fuel is
then supplied
via
an auxiliary
system,
the
idling system, which
consists
of the idling
jet
(8),
the
idling
air
jet
LLD
-
no spare
part
-
and
the
mixture
control
screw
(49)
which
is sealed off against the carburetorhousing
by
the
rubber
ring
(9)
and secured
by spring
(50)
to
prevent
it from
bcoming slack.
The fuel passes
through
the
idling
jet
(8)
whose
bore
will
determine the amount of
fuel.
Behind
the
jet
bore the
fuel mixes
with air
which is
supplied
via
cross
ducts
in
the
jet
throatfromtheidlingairchannel, the arnoUhtof
airadminedbeingdetermined by the
idling
outlet
bore
(LA),
the cross-sectional Areb of
which
can be adjusted
by the
mixture
control screw
(49);
it
then
hac?rps'tlschoke
tube
via
bypass or
transition
passages
(BF),
where it
is mixed f,urthet with
purc
air.
ONOTE:
t.
rt
L\
,:
Adjusting
the
idling
sp€ed should always be
done
at operating
temperaturcs.
.i
':.
I
First,
completely close the
mixture'control'scnew.(49)
by turning
clockwise and
then open up again
by
the number
of turas,a$,gp,apified.
INOTE: Turning inclockwfsE'd*rectiohtrrsults in
a
leaner
mixture
and
turninganttclodsrn*,defnth*ic,henmixture.
The idling
setting
quoted
**rr* aguide onlii'f't" optimum
will
generally
differ
slightly.
First
select the desired'idling'speed,bf using the idling stop screw
(45).
When subsequently adjusting,rhamixtune,control screw
(49)
-
starting from
the
basic setting
-
a speed
drop
will':be noticbd
in
both directions.
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