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General Information - Ducati 900SS Workshop Manual

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Table of Contents
GENERAL
.
m•
....
================================~rF
ENGINE
750
s.s.
900
s.s.
Tw
in-cylinder, 90° l
lype con
figuro
lion,
4·stroke.
Bore
in.
·..
..
..
..
..
.. .. ..
.. ..
.. ..
..
.. .. .. .. .. .. ..
.. .. .. .
.
.
3
.
464 5
3 .
6 2 20
Stroke
in
................................................
2
.4212
2.6771
Total disploment
cu .in
.....
...
............
..
... ......
45.63
55.14
Compression
ratio
..
.
..... ......
...
..... ....
I
:9±0.5
I
:9,
2±0,5
M
ax.
pow
er
(a
t
the
w heel)
kW
[HP) ...
..
.
..
£14
.
1
[601
56.3
(731
a
t
rpm
...
....... ......
.............
..
..
8
.500
7 .000
Max.
engine
speed
................................
9.000
IMPORTANT
·
Under
no circumstances
the
engine must goes over
9000 rpm.
TIMING
SYSTEM
•DE
SMODROMIC •
timing system, two valves
each
cylinder, controlled
by four
rocker arms (two
opening and two
closing
rocker
arms) and
by four lobes
O.H
.C.
It is
controlled by
the
driving
shaft
through
cylindrical
gears,
pulleys
and
toothed
belts. The
valve
opening
and
closing
diagram
is the
following.
Checking data with o clearance of:
in
.
.. ......
0 .008
0 .04
Inlet
valve:
d iameter in
... ........
........
..
........
1.6
14
1.693
Opens before T.D
.C.
.
..
...
.. ...
..
....
..
..
.
..
...
3
20°
Closes
after
B.D.C.
.......
.. .......
...
..
.....
..
....
88°
60°
Exhaust valve
:
diameter in.....
...................
1.378
1.496
Opens before
B.D
C... .. ..
...
... ...
..
..
..
......
72o
58°
Closes
a her
T.
D. C.
.
.. ..
.
. . .
.
.. .
..
..
.
..
.
..
.. . ..
.
..
.
46°
20°
O pera
tion
clearance
of
valve
lappets,
with
cold eng
ine,
must
be:
Opening rocker
arm:
0 .0031 +0.0039 in
.
(Inlet)
0
.0039+
0 .0047
in.
(Exhaust)
Closing rocker arm
.
0+0.00078
in.
(Inlet
and Exhaust)
Lift:
(checking do to
w
ith
a
clearance
of
0
in.)
Induction in.
..
.
.. .
.. .
.
..
.
.
. .
..
..
..
.. ..
..
.
.. ..
.
. .
.
...
..
0
.
368
0 .463
Exhaust in
.....
..............................
.......... 0.334
0.415
FUEL SYSTEM
The
fuel
feed system
components ore
located
inside the
fuel
tonk,
so
they o re
not
visible
from
outside.
Dry air inlet ond
cleaner, located under
the fuel
tonk.
The
fuel feed
system is
so
constituted
.
l ) Fuel filler
cop:
2
)
Fuel
level
ind icating device,
3
) Fuel
hand cock for
stopping
the
fuel feed;
4) Fuel filler;
5) Electric
pump;
a)
Delivery
pipe;
6
) Pump filter
b) Return
pipe;
7) Brea
ther
valve,
c)
Drain
pipe.
A.8
750
S.S.)900
s.~
Provided
w
ith
a
carburetor:
.
. . .
.
.. ..
.
.
.
.
.
.
..
M IKUN
I
Type
....
..
..
......
....
.....
....
...
.....
...............
...
BDST 3B·B70IBDST
38·867
Carb. Main specifications
I
-
Choke (mm)
..........
.....
...............
...
38
- N
eedle
valve
jet
..
.. ..
.. ..
.
.
.
.
..
..
..
.
..
.
.. .
.
..
Y-6
!
2
-
Ma
in
jet.
.... ......
......
.
140
- Starting
jet
.
..
.
.
..
..
.
..
..
.
. .
. .. .
.. ..
.. . ..
.
..
..
..
.
70
-
Idling
jet.....................
....
.....
... ....
..
.....
37.5
I
42
.5
-
Needle jet
..
..
..
.. .. .. .. .. .. .
..
.
.. .. .. . ..
.. ..
..
.
..
5C 19
{pos.
from top)
........
...
.........
.....
... ..
3rd
I
4th
LUBRICATION
By pressure through o gear
pump, oil
purification
through o
net filter,
filter
with
cortdridge
and low
pressure temperature
indicator
placed
on
the
instrument board
.
L
ubricant
cooling
radiator
(900
S.S.)
Lubricolion
circuit:
1) Pipe union
for oil sump
brea ther w
ith
recovery chamber
2) Oil filling plug.
3)
Oil
level
indicator.
4
)
Oil drain plug
.
5
)
N et filter.
6
) Filter
cartridge.
7)
Pressure
switch.
8)
Radiator.
1
1
5
750
s.s.
5
6
900
s.s.
6
8
I
\
(
)
'
'
,.
'-..../

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