Table of Contents
Advertisement
Fig
.
2-74
.
Fast id le
VO
LVO
104
444
same air valve I,ift. This ,is check ed easily by simply
making sure that the distance visu,ally between the
bri,dg,e ef the 'carburetter heusing and the air valve
is the same fer both carburet,tors. A mere accurate
syncnreniza,tien is net requ,ired.
4. Adjust with rtheidle trimming screws 7,
Fig.
2-50
from the hasic setting, which is 2 screwed-eut turns
ef the screw se that the best ,idling speled is
ebtained. Screw equdly for beth carburetters.
5. Adjust the ,Iink reds. With the ,centrO'I against its
step en
,
t he manifeld bracket, rt-helink reds sheuld
be adjusted se that there is a dearance ef abeut
0.1
mm
(0.004/1)
between the lever and the primary
threttle
~pindle
flange. See Fig. 2-73.
6. Adjust se that the valve centrO'I ef the het start
va,lve is aga'inst the carburefiter lever with the
valve pisten in rthe upper pesitien and the threttle
cen.trel a,t idle. (See ,f;igs.
2-64
an.d
2-65.)
Lubrica1"e the centact surfaae with Melykete and
check that the engine retu-rns te idling speed af ter
briefly revving -up several times.
7.
Setting rthe ,past id le : Pull eut the cheke contrei
23-
25
,mm (allmest
1/1)
se thart the mark en the
rapid idle cam cemes eppesite the centerline ef
the rapid idle screw. See Fig
.
2-74.
Then adjust the raprd idle screw te give an engine
speed of
1100-
1300
r.p.m.
Fig. 2-75.
Funnel for exhaust evacuation
SETTING WITH CO-METER
VO LVO
103732
The setting should be made at a temperature of
60-
80
0
F and must be made within 8 minutes after the
coolant thermostat has
opened.
Warming-up should
be done with a completely cold
engine.
Wh en me a'surin
g
with
a CO-
meter,
it ,is impol1tant
th
at
the
carburettor
te mperature
is
th
e
ce
rrect e
ne. Wh en
the engine is idling, th
e
fleatchambe,
r is expese
d te
heat radiaf1ien
f
rem the exhaust manifold whi,le th
e
flew efceld fu,el threugh rthe fleatchamber is sma,l!.
The resultant rise in temperafure ,causes an increase in
the fuel How threugh the jet due te
,
t he alternartion in
the visc'Osity and the increase in rthe CO-value. Ra'cing
the engine speed ceels :the ca'rburettor te a cel1tain
extent due te the
~tep
up ,in the fuel Hew. The tempe
-
rat
ure can be checked te make sure that it is net
excessive by feeling the fleakhamber with the hand.
It sheuld "feel celd", that ,is, it mereer ,less sheuld net
exceed reom temperature.
In erder te be certain
,
t hat th
e
measu'red CO-value is
corred,
measuring should be carried out within the
time pe
ri
od mentioned above.
There are a number ef different types ,ef CO-meters
ava ilable which fundien with acceptable accuracy.
The instructiens en their use accompany each meter.
Nete
tha,
t when cennecting the hese fer evacuating
the exhaust gases, the hese must not be placed se
that the
exhau'
s .f gases are cempletely evacuated from
the CO-merter cennection te the exhaust manifeid.
A funnel, see Fig. 2-75 ceulld suitably be used
here.
With the funnel install ed, the suctien at .the cennec
-
tien weul,d net be se g'reat as
{
te upset the measuring
bu,t sufficient
,
t e suck up the exhaust gases se that
they de net fill the werkshop.
When doing any measuring with rt-h
e-
CO-merter, it is
impertant rthat the exhaust pipeand sil'encer are
In
goed conditien, tha,t is, they de
netleak.
2
: 33
Advertisement
Table of Contents
