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CARBURETION
CARBURETTORS ( .... l;g.357)
n.2 Dell'Orto PHF 36 B (D) r;ght • PHF 36 B
(S)
left.
Controle
-
Throttle
control
twist grip
on the
R/
H
side
of
the
handlebar.
-
Starter
control lever
for
starting a cold engine
located on the rocker box cover of left
cylinder.
"
A
..
starting position - cold engine.
"a ..
riding pOSition.
Note
:
With lever in position
..
e. ensure that
there
is a play of about 3 mm between
the
..
starter,.
control
cable
ends and the cable adjuster screws
..
E» on both
carburettors.
Standard carburetior setting
Choke
Throttle
(3)
Atomizer
Main jet
Idling jet
Starter jet
Pump jet
Needle
Floater
Opening of idling
adjuster screw
"
mm36
60
265 AS
135
60
70
38
K 5
(2nd.
notch)
gr10
1
turn
and a half
FLOATER LEVELLING
(see
I;g
. 268/
1)
To level the floaters
in
carburettors proceed
as fol'lows:
1
Loosen the screws securing the bottom
chamber to the carburettor body and take
out the chamber itself.
2
Turn the carburettor upside down
(without
bottom chamber) so
that
the needle
on
the
floater body closes the
petrol
flow
in.
3
Place the tool 14926900
(72
in
fig.
236)
on
the plane of the carburettor body (where
the bottom chamber is screwed to) and
make sure that the two
floaters lightly touch
the tool inskle.
182
Otherwise
adjust either
the
floater
pin
or
the
floaters
themselves
(paying attention
that
these are very brittle parts) until the
fioaters are properly aligned with the tool.
The
clearance
between the carburettor body
plane and the floater upper side has to be:
-
mm 23,5 (for carburettors having 10 gr
floaters).
Adjusting carbureUon and Idling Ipeed
(fig.
357)
Should a proper .Vacuum Meter. not be avai-
lable, this adjustment is made as follows:
1
Warm the engine at
its
running temperature.
2
Screw idling adjusting screws
.
C,.
(fuel) fully
in, then screw them out by one turn and a
half.
3
By means of
your
hands feel
if
pressure at
exhaust
outlets is
the same. In
case
of diffe-
rences, act on screw
.. D.
of
one
carburettor to
equalize such
pressure.
(Idling
speed will have
to be
kept
at 1.000
-:-
1.100
r.p.m.
consequently
it will be necessary either to screw
in
the carbu-
rettor screw of the cylinder having a lower pres-
sure or
to
screw
out
the carburettor screw of the
cylinder
having a higher pressure)
.
4
Get
the best carburetion for each cylinder
by acting on screws
"C. (this
will be at the point
where the r.p.m. slightly increase)
,
then get
idling speed according
to
point 3.
5
Disconnect one spark plug lead at a time and
check
that the engine stops after firing the same
number of
strokes.
If this does not occur, pro-
ceed as follows:
-
screw
out the
carburettor screw "0,, of the
cylinder
causing the engine firing a higher num-
ber of strokes;
-
screw in the
carburettor
screw
"D.
of the
cylinder causing
the engine firing a lower num-
ber of strokes.
6
Adjust idling speed to 1.000 -:- 1.100 r.p.m. by
screwing in or out in the same quantity both
screws
,,0,..
7 After closing the throttle
control
twist grip
check
that there is a clearance of 1 -:- 1,5 mm
between cable ends and adjuster screw
..
A.,
handlebar
side,
otherwise loosen nuts
..
8" and
screw
in
or
out adjuster
"A
•.
Afterwards lock the nuts "8,,
(fig.
358).
8
Check that both throttles open at the same
time by proceeding as follows:
-
Turn slowly the throttle control twist grip and
check
with both hands that the pressure at ex-
haust
outlets increases
simultaneously. In case
such increase is not simultaneous, adjust the
carburetion of the
cylinder
in advance by scre-
wing adjuster
",A .. in (after loosening
counter-
nut
,,
8.
(lig.
358) until the pressure is the
same
for
both
outlets.
ADJUSTING THE CARBURETION
BY MEANS OF A .VACUUM METER.
(see fig. 357)
1
Adlustlng Idling ser . . . (fuel): through screws
"C",
screwing these in reduces the fuel flow whi-
le screwing these out increases the fuel flow. To
adjust drive screws fully home then unscrew for
one turn and a half for both carburettors.
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