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3
using
both
your hands.
check
il the
exhaust
pres-
SUfe at
the
s
ilencers exit is aboul the
same
with
the
e
ngine runn ing
at
no more
than
1000
-0-
1200
rpm.
To
obtain thi
s
speed
it
may
be
necessary
to
screw
i
n
the
carburellor screw
01
the
c
ylinder
giving a lower
pressure or
to screw
out
the
screw
of
the
carburetlor
giving
a
highe
r
pressure
:
4
turning
screw
.. C»,
adjust
each
cylinder
so
il gives
its
besl
c
arburalion
i.e. w
hen a slight
increase
0
1
the
revs
number is pe
rc
eived
and
then
re-ad
jus
t
the
idling
speed
as desc
ribed
in
section
..
3,.
;
5
disconnect
one
01
the
plug leads (one
al
the l
ime)
and ensure
the
engi
ne slops
exactly
al1er
the
same
amount
01
firing
strokes.
If not
,
Unscrew
screw
..
0
.
conc
e
rning Ihe
carbureHor
of the
cyli
nder
giving
a
higher number
of
firings or
screw in
the
screw of
the
carburettor concern
ing
t
he
cylinder
gi ving
a
lower
numbe
r
of
fi
ring
strokes
;
6
adjust
idling speed at
1000
-0-
1200
rpm, screwing
in or
oul
idling screw
..
0
..
by the
same
a
mount
:
7
ensure that
with
the
throttle
grip fully
closed,
there is
a
cable terminal-adjuster
..
F» play
of
about
1
+
1.5
mm
(.039
-7-
.059")
.
If
not,
loosen nuts
"
G»
and
screw in or
out
adjusters
«F».
This done,
dont
forget to lock
again nuts
..
G_:
8
check synchronization
01
the throttle
valves
ope-
ning proceeding as follows:
by the aid
0
1
an assi-
stant,
turn gradually and
slowly
the
twist grip ensu-
ring
with
both hands that the pressure
increase
at
the silencer exits is
even
and
synchronous.
If not, I.e. one cylinder is more
advanced
than
the
other, adjust the control cable
operating on thumb
adjuster «F» after undoing nut «G» until
the
pressure
emitted
by both cylinders is
even:
9
ensure both starter control cable terminals
at
the
thumb adjuster
ends have a free play
of about
3
mm
(.118").
7.5
ADJUSTING CARBURATION USING
.A
VACUOMETER
(See
fig.
84)
Proceed as follows:
1
set up the byke
on
the
cen
tre stand
;
2
drive
screws "C
..
(fig. 62)
home fully
and undo
them
1111
turn
s
for
each carburettor
;
3
remove plugs
and
washers
on
intak.e
pipe
..
H
..
(fig
.
82)
;
4
screw
in Ihe vacuometer
pipe connecto rs
..
A
-..
in
the
intake p ipe
ho
les;
5
with the
engine
at
idling
speed
and
its
operating
temperature,
adj
ust
screws
..
0
" unl
il
bo
th
merc
ury
columns
"
s
..
~Te
at
same height
o
n the
vacuome te
r
dIal
«C
..
(fig.
82)
;
6
adjusl
positio
n
of
idling
screws
«C
..
to oblain the
highes
t
possible idling
revolutions
and then
re-chec
k:
the position
of
Ihe
me rc
ury
columns
on vacuometer
dial
..
C
...
If
necessary,
repeat
operation
n.
5
;
84
51
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