O.S. Engines IL-300 - Manual (Page 13)

24
THROTTLE VALVE ADJUSTMENT
Needle-valve adjustment
Adjust the needle-valve following the instructions given in
STARTING section.
Mixture control valve adjustment
The carburetor of your IL-300 has been factory set for the
approximate best result with the fuel tank located in the normal
position (i.e. close to the back of the engine and where the
level of the needle-valve is at 1/3 height of the tank), but the
setting may, in some cases, vary slightly in accordance with
fuel and climatic conditions.
After running-in is completed and the needle-valve is set at
optimum position (approx 40 open from maximum r.p.m.
position), check the idle speed and adjust only when
necessary.
25
Start the engine.
open the throttle fully
.
Adjust the needle-valve.
Close the throttle gradually.
Set the idle speed.
Open the throttle fully.
Does the engine regain full power?
Continue running at high speed for 5 seconds.
Close the throttle.
Run at idle speed for 5 seconds.
Does the engine stop?
Apply full throttle.
Does the engine regain full power immediately?
OK
Re-set the idle speed a little higher
S
e
t
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e
t
h
ro
tt
le
o
p
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in
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b
y
m
ea
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o
f
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e
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ro
tt
le
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o
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th
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tra
ns
m
itt
er
s
o
th
at
th
e
lo
w
es
t
pr
ac
tic
al
s
pe
ed
, w
ith
ou
t r
is
k
of
th
e
en
gi
ne
s
to
pp
in
g,
is
o
bt
ai
ne
d.
The position where the lowest p
o
ss
ib
le
r
.p
.m
.
,w
it
h
s
te
a
d
y
running, is obtained. Approx 40˚
open from maximum
r.p.m. setting.
Yes. No.
Yes.
One of the cylinders ceases firing.
Disconnect the glowplugs from the battery. Make sure that all 4 cylinders are firing. Make sure glowplug switch is on.
The
engine
hesitates
before
picking
up
to
full
speed,
or
appears
to
run
at
medium speed with reduced power. C
he
ck
m
ix
tu
re
ad
ju
st
m
en
t
at
id
le
speed.
Make
sure
that
all
cylinders
are firing.
Adjustment should be carried out after stopping the engine. Do not move needle-valve while adjusting other controls.
Repeat the procedure while opening and closing the
throttle until the best result is obtained.
Attention: Do not leave the battery connected while adjusting the carburetor.
One of the cylinders ceases firing.
One of the cylinders ceases firing.