Ducati 900SS Workshop Manual page 7

GENERAL
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COOLING SYSTEM
Air. cooling through the Iorge cooling fin surface of cylinders heads.
The cylinders ore further cooled by the motor oil.
IGNITION SYSTEM
Electronic type with inductive d ischarge system .
Make ............. ...... ...... ... .. .................. . .. .. KO KUSAN
Automatic advance:
- up to 1700 rpm±200 .. .. .. .. .. . . . . .. .. . . .. . . . .. .. ........ ... 6°
- 1700 to 2600 rpm±300 ... progressive up to 32°
(Check using a stroboscopic light)
Spark plugs
Make ........... ............ . .
Type
Electrode gop
TRANSMISSION
7
so s.s.
1 900
s.s.
C HAMPIO N
RA6HC I RA6YC
0 .0236 in .
Multiple-disk dry clutch:
7 +7
with 13 friction surfaces
(900 S.S.);
multiple
dry clutch 8+7 w ith 17 friction surfaces
(750 S.S.)
controlled by on
hydraulic circuit operated by a lever on the left side of the handlebar.
Trosmissione between engine and main shaft of geobox w ith straight
toothed gears
Ratio .. ............. .... . .............. 7 1/ 36
I
62/3 1
5 ratios
(750 S.S.)
6 ratios
(900 S.S.)
gearbox w ith costont meshed
gears ; the id le geors ore supported by roller coges. change kick to
the left.
Gear ratios 750 S.S.
!
900 S.S.
I st speed . . . ... .. .... .. .. ......... ... .. ... .. .... . 40/ 16=25 37/ 1 5=2.46
2nd speed . .. .. .. . .. .. ..... ......... .... ... 36/2 1=1.71 30/17=1.76
3rd speed .. .... .. .. .... .. .. ....... .... ... .. .... .. ... 32/24= 1.33 27/20= 135
4th speed ... ...... .. .... ..... ... ... .... .. . .... 29/27=1.07 24/22= 1.09
5th speed ........ .. .. .... .. .. ...... .. ....... .. ...... .. . 28/29=0 96 23/24=0 95
6th speed .. .. .. .. .. .. .. . .. .. .. .. ... .... .... .. . .. .. .. . 24/28=0.85
Transm ission between gearbox and rear wheel through chain:
Make ... .. ................ ..... .. ... ................ ... .. DID
Type .. .. .. ......... ... .... .... .. .... .. .. .. .. ... ... .. . 520 VL 2
Dimensions ... . . . . . . . . . . . . . . . . . . ... . .. .. .. . .. .. . ... . . . I
I
4"x5/8"
N ° links .. .. .. . .. .. .. . . . .. .. . . . . . . . . .. . .. .. . .. .. .. .. . .. . 96
!
98
Final drive ratio (pinion · crown). . ... . .... . .. .. . . 15/37
BRAKES
Front
Floated drilled disc type, bi-metall ic (n°2 for
900 S.S.
and n° I for
750
S.S.).
Disc dio. . .. .. .... .... .... .. .. ......... .... .. .. .... ... ... .. ..... .... 12.6 in.
Hydraulic lever control on the R/H side of handlebar.
Braking surface .. .. .. ...... ..... ..... ... . ... 13.64 sq . in.
Broke cali pers
750 S.S. 900 S.S.
Make . .. .. . . .. .. . . .. .. .. .. . .. . .. . . . . BREMBO
Type . . .. . .. .. .. .. . .. .. .. .. ... .. .. .. .. .. .. . .. P4 30/34 : P4 32d
j
(Up To 1600)
P4 30/34
(From 1601}
Pump type . .. .. . .. .. .. .. . .. .. .. .. . .. . . .. PS 1 3
i
PS 15
Friction material.. . . .. . .. . .. .. .. .. .. . .. .. . .. FREN-DO 965
Rear
Fixed and drilled disc in steel.
Disc diameter .......... ..... ......... .... ..... ... .... .... ..... .... ...... 9 .64 in.
Hydraulic pedal control on the R/H side of the bike.
Braking surface.. .... .. ... ... .. . .. ............ ... .... ..... . 4 . 123 sq. in.
Broke caliper:
Make ....... .. .. ....... . . .. .. .. .. .. .. .. ... BREMBO
Type ..... .......... .... ..... ....... ... ........ .. .. .. ....... ...... ... ... .. P21 05N
Pump type . . .. .. . .. . . . . ........ ......... . PS 1 1
Friction material .. .. . ... ...... .. ........ .... .. .. ... FREN-DO FD 72 GG
FRAME
The frame is a tubular type with Chrome-Molybdenum steel trestle.
Sleeve inclination (moto rbike without pilot) . . .. 25°
Steering ang le (each side} . . . . . . . . . . . . . . . . . . . . . . .. .. ..... ... . ... .... .. . 25°
Forward stroke . . . .. .. .. .. .. . .. . .. . . .. . . ... .. .. .. .... .. 4.055 in
SUSPENSIONS
Front 750 S.S. 1900 S.S.
Oil-dynamic fork with overturned legs and w ith outer broke setting
system
of
rebound, compression and spring preload
(900 S.S.).
Make .. ... .. .... ..... ..... ... .... ... .... ... ..... .. ... ... SHOWA
Type ... .. ....... ..... ... ..... ... ... ...... .... GD03 1 I G D011
Barrel diameter: in. .. .. .. .. .. .... ..... .... .. ... .. ... 1 .614
Stroke: in. . . . . . . . . . . . . . . . . . . . . . .. .. .. .. .. .. . . .. .. .. . .. . 4 .724
Oil quantity each leg : cu.in. ... .. ... .. ... 27.87
i
26.84
Oil level to the barrel: in. ... . ...... .... .. ...... .... 3.126
I
4.252
Rear
Swinging arm in aluminium
1
w ith adjustable oil-pneuma tic mono·
damper during rebound and compression .
Make ..... .. ..... ... ..... .. .... .............. .. .. SHOWA
Type ..... . .. .. .. .... .. ... ...... ..... ...... ... .......... GD 022-007-QX
Stroke .. .......... ...................... .... ..... .. ......... .. ...... ... . 2 .56 in
The fork rota tes a round a journal passing through the engine; this
configuration makes the motorcycle more sturdy.
WHEELS
Light-alloy rims w ith three spokes.
Front 750 S.S. 900 S.S.
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BREMBO
Dimensions . .. . .. .. .. . .. . .. .. .. . .. .... .. ... 3 .
SOx
1
7"
i
3 .
SOx
17"
Rear
i
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BREMBO
Dimensions ......... .. .... .... 4. 50x 17 "15 .50x 17"
Wheels ore of removable-pin type.
The rear wheel is fitted with a special flexible coupling .To rem ove it
first toke out the cha in.
TYRES
Front 750 S.S.
j
900 S.S.
Radial "tubeless" type .
i
Make . . . .. .. . . .. . . .. . .. .. .. . . .. .. .. . .. . .. M ICHELIN
Type .. .. . . . . . . . .. . .. . .. .. .. .. .. .. .. ... .. .. .. .. ... . A59X
1
A59
Dimensions ... .. ..... .... . .. ... .......... ..... .. .... .. . 120/ 6(} 17! 120/ 70-17
Rear
I
Radial "tubeless" type.
Make .. .. . .. . .. . .. .. .. . .. .. .. .. .. . .. .. .. .. .. .. .. .. .. . .. .. MICHELIN
Type . . . . . . . . . . . . . ... . . . . . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . M59X
I
M59
Dimensions ..... ..... .. .. ............ ... ...... ..... ..... 160/ 6(} 17 170/ 6(} 17
A.9