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44
Adjusting the carburetion and
idling
speed (hand adjustment)
(fig. 29)
Proceed as follows
Warm the engine to its normal running tem-
perature.
2
Fully
screw
in screws
«E»
idling adjusters
,
then undo them by 1 turn and
a
half.
3
Check with your
hands
if the
exhaust pipe
pressures
are equal.
If
necessary
act on screws
«0» of a carburettor
until the
pressure
wil
l
be
the same
(idl
ing
speed will have to
be
kept at
900-1000
r.p.m. about; as a consequence
it
w
ill
be
necessary to screw
in
the screw of
the
car-
burettor
for
the
cylin
der giving
a lower exhaus
t
pressure
,
or
screw
out the screw of the carbu-
rettor for the
cylinder
giving
a
higher
exhaust
pressure)
.
4
Acting On sCrews
«E»
get the best carbura-
tion for each
cylinder (it
is realized by an in-
crease of r.p.m.) and adjust then idling
speed
according
pOint
3.
5
~isconnect
one spark
plug lead
at a time and
check that
the
engine in both cases stops after
firing
5-6 strokes. If this does
not
occur,
screw
out screw «0" of
carbu
reitor
making the engine
firing more
than
5-6
strokes.
or -
if this
is
the
case
-
screw
in screw
«0
» of carb
urettor
ma-
king
the
engine
firing
less
than
5-6
strokes.
6
Adjust idling speed at
900-1000
r.p.m
.
by scre-
wing
or unscrewing
both
screws
«0
»
by the
sa-
me
amount.
7
With
throttle control
grip
clos
ed check
that
there is a
clea
ran
ce of
mm
1
-7-
1.5
(.039"
--'-.059")
between
cable ends
and
wire adj
uster
screws
«F»
of both
carburetto
rs.
8
Ensure
that
throttles
open
si multaneously
by
proceeding
as follows
:
gradu
ally
turn
the
throt-
tle
control
grip and
c
heck
that
exhau
st
pipe
pressure
inc
reases in
synchroni
zation
by means
of
both
hands.
(An
assi
stant
will
be
needed for
this
operation
).
If
pressu
re in
creas
e of one
cyl
in-
der is advan
ced
,
act
on its
carb
urettor
by
gra-
dually
screwing
in
wi
re
adjuster
«F».
after
loo-
sening
counternut
«G»,
unti
l
the synchronization
of
both
exhaust pipes pressure
is
reached
.
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