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Ducati 900SS

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Make Model

Ducati 900 SS

Year

1975

Engine

Four stroke, 90°“L”twin cylinder, SOHC, 2 valves per cylinder, bevel gear driven

Capacity

864 cc / 52.7 cu in
Bore x Stroke 86 x 74.4 mm
Compression Ratio 9.5:1
Cooling System Air cooled

Induction

2 x Dell'Orto PHM 40 A, B or C carburetors

Spark Plugs

Champion L81 / L82Y / L88A / Bosch WM7B

Ignition

Electronic

Battery

Yuasa 12N/12A-4A-12V

Starting

Kick (electric as an option)

Max Power

58.8 kW / 80 hp @ 7500 rpm

Clutch

Wet, multiplate

Transmission

5 Speed

Primary Drive Ratio

2.187:1 (32/70)

Gear Ratios

1st 2.237 / 2nd 1.562 / 3rd 1.203 / 4th 1.000 / 5th 0.887

Final Drive Ratio

2.312:1 (16/37)

Final Drive

Chain

Front Suspension

38 mm Marzocchi fork

Rear Suspension

Marzocchi 310 mm dual shocks, 3-way adjustable

Front Brakes

2 x 280mm Disc, 1 piston caliper

Rear Brakes

Single 229 mm disc

Front Wheel

3.50 - 18

Rear Wheel

4.00 - 18
Dimensions Length: 2200 mm / 86.6 in
Width:     675 mm / 26.6 in
Height:  1050 mm / 41.3 in
Wheelbase 1500 mm / 59.0 in
Seat Height 760 mm / 29.9 in

Dry Weight

188 kg / 414 lbs

Fuel Capacity 

20 L / 5.3 US gal / 4.4 Imp gal

Standing ¼ Mile   

12.6 sec

Top Speed

217 km/h / 135 mph

Colours

Silver frame, silver and blue
Manual Bevelheaven.com
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Ducati's original 900 Super Sport was one of the most single-minded sporting superbikes that ever devoured an innocent public road. It was essentially a street-legal production racer: fast, raw and uncompromising. It handled and slopped brilliantly, looked and sounded gorgeous and was a match for anything on road or track.  The 900SS owed its existence to Ducati's victory in the Imola 200 race in 1972. when factory pilots Paul Smart and Bruno Spaggiari had finished first and second ahead of numerous factory opponents. The factory celebrated by producing a small batch of road-legal replicas of the racebike. These were popular, so more were built, this time called the 750 Super Sport instead of Imola Replica as the model had initially been known. 

Racing success

Ducati built only about 200 bikes, but all were snapped up and some were raced with good results in 1974. The Bologna factory was encouraged, and the following year created the more widely available 900SS, by replacing the smaller engine with a V-twin unit based on that of the existing 860GT. This combined a bigger. 86mm bore with the original 74.4mm stroke, giving a capacity of 864cc. Like the smaller model, it featured Desmo valve gear. polished conrods. unfiltered 40mm Dellorto and barely silenced Colitis  Those mods lifted peak power to an impressive 79bhp at 7000rpm at the crankshaft, or 68bhp at the rear wheel, and the 900SS had the chassis to match. Like its 750SS predecessor it was starkly functional, with its half-fairing, clip-on handlebars, rear seat footrests. twin drilled Brembo front discs, and racy single seat. There was no electric starter, nor anything else not required for the bike's sole purpose of providing high performance. 

The 900SS roared to a top speed of 135mph (217km/h). and cruised at 100 mph (161km/h) with a smooth, long-legged feel. That was seriously fast in 1975. and the Ducati's handling was even better. It was not the most agile of bikes, but no rival could match the cornering poise and high-speed stability provided by the lean V-twin's blend of rigid frame, long wheelbase and taut Marzocchi suspension. Roadholding. braking and Ground Clearance were all exemplary too. 

The uncompromising 900SS demanded commitment from it rider, and was too extreme for some. But it made a superb production racer. And for road riders who were captivated by its beauty, speed and pure-bred character, there was no bike to touch it. To paraphrase a road test of the time, the 900SS was a distillation of all the thrills and sensations that made high-performance motorcycling worthwhile.

Source of review: Fast Bikes Roland Brown