General Information - Ducati 900SS Workshop Manual

GENERAL
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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 1° 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
!
Y· 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
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