Ducati 900SS - General Information

GENERAL
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ENGINE 750 s.s . 900 s.s .
Twin -c ylinder, 90 ° l lype con fi gurolion, 4·s tr ok e.
Bore in. ·.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . . . 3. 4 64 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. po wer (at the wheel) kW [ HP) ... .. . .. £14 .1 [601 56 .3 (731
at r pm ... ............. .......... ..... .. 8. 50 0 7 . 000
Max . engine speed ................................ 9.000
IMPORTANT · Under no circumstances th e engine must goes over
9000 rpm.
TIMING SYSTEM
•DE SMODROMIC • tim ing system, two va lves each cylinder, controlled
by four rocker arms (two opening and two closing rocker arms) and
by four lobes O.H . C.
It is co n tr olled by the dri vi ng shaft th ro ugh cy lindrical gears, p ull e ys
and toothed be lt s. The va l ve opening and cl osi ng diagr am is the
following.
Checking
data with o clearance of: in . ........ 0 . 008 0 . 04
Inlet valve: diameter in ... ........ ........ .. ........ 1 .6 14 1.693
Op ens before T.D.C. . .. ..... . .. .. ...... ... .. ... 3 1° 20 °
Cl
oses after B.D.C. ....... .. .......... .. ........... 8 8° 60 °
Exhaust valve: diamet er in..... ......... ........ .. 1. 378 1.496
Opens before B .D C... .. .. ..................... 72o 58°
Closes a her T. D. C. . .. .. . . . . . .. . .. .. . .. . .. .. . .. . .. . 46° 20°
O pe ra tion cl ea rance of val ve lapp ets, wi th co ld engin e, mu st b e:
Op ening rocker arm:
0 . 0031 +0 . 0039 in . (Inlet)
0 . 0039 +0 . 0047 in. ( Exhaust )
Closing rocker arm. 0+0 . 00078 in. (Inlet and Exh aust )
Lift:
(check in g doto with a clearance of 0 in .)
Induction i n. .. . .. . .. . . .. . . . . .. .. .. .. .. .. . .. .. . . . . ... .. 0 . 36 8 0.4 63
Exhaust in ..... .............................. .......... 0.334 0.415
FUEL SYSTEM
The fuel feed sy stem comp on e nt s ore located i nsi de t he f uel ton k, so
th ey ore not visible from ou tsid e.
Dry air inlet ond cleaner, located under the fuel tonk. Th e fuel feed
system is so constituted.
l )
Fu el filler c op :
2) Fuel level indicating device,
3)
Fu el hand cock fo r st op ping the fuel feed;
4)
Fuel fille r;
5) Electric pump; a) Delivery pipe;
6 )
Pu mp fi lt er
b) Ret ur n pipe;
7) B
re a th er valve,
c) Drain p
ip e.
A.8
750 S.S.)900 s. ~
Provided wi th a carbure to r: . . . . . .. .. . . . . . . .. M IKUN I
Type .... .. .. ...................... ...... .......... ....... BDST 3B·B70 I BDST 38·867
Carb. Main specifications I
- Choke (m m) .. ........ ..... ............... ... 38
- N eedle valve j et .. .. .. .. .. . . . . .. .. .. . .. . .. . . .. Y-6 ! Y· 2
-
Ma in j et. .. .. ............. 1 40
- Star ting jet . .. . . .. .. . .. .. . . . . .. . .. .. .. . .. . .. .. .. . 70
- Idling jet........... .......... ......... ... ...... ..... 37 .5 I 42 .5
- Needle jet
.. .. .. .. .. .. .. .. .. . .. . .. .. .. . .. .. .. .. . .. 5C 19
{ pos. fr om top) ........ ... ......... .......... 3 rd I 4th
LUBRICATION
By pressure thr ough o gear pump, oil purification through o net filter,
filter
with cortdridge and low pr essure temperature indicator pla ced
on the instr
um en t board. Lubricant cooling ra dia tor ( 900 S.S.)
Lu b ri colion cir cu it:
1) Pipe un io n for oil sum p breat her w ith recovery chamber
2)
Oil filling plug.
3)
Oil level indicator.
4)
Oi l drain pl ug .
5) N et
fi lter.
6)
Filter cartridge.
7)
Pr essur e s wi tch.
8)
Rad iator.
1
1
5
750 s. s.
5
6
900 s. s.
6
8
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