Ducati 900SS (1977-78)

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The Ducati 900 SS motorcycle was produced between 1977-78 and had a four-stroke, 90-degree L twin, SOHC, 2 valve per cylinder, and bevel gear driven engine with a capacity of 864cc. The bike featured an air-cooled system, 2 Dell’Orto PHM 40A, B, or C carburetors, and electronic ignition with a Yuasa 12N/12A-4A-12V battery. The 5-speed transmission had a wet, multiplate clutch with a primary drive ratio of 2.187:1 and gear ratios of 1.562, 1.203, 1.000, and 0.887. The final drive had a ratio of 2.312:1 and was chain-driven. The bike had a 38 mm Marzocchi fork for front suspension and Marzocchi 310 mm dual shocks for the rear suspension, which were adjustable. It featured 2 x 280mm disc brakes with a 1 piston caliper for the front and a single 229 mm disc brake for the rear. The bike had a length of 2200 mm, width of 675 mm, height of 1050 mm, and a wheelbase of 1500 mm. The seat height was 760 mm, and the dry weight was 188 kg. The fuel capacity was 20 liters, and the bike was able to reach a top speed of 217 km/h or 135 mph. The manual is available at bevelheaven.com.

Technical specifications:

Make Model: Ducati 900 SS

Year: 1977 – 78


Engine: Four stroke, 90 degrees 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: 49.2 kW / 67 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 1/4 Mile: 12.6 sec
Top Speed: 217 km/h / 135 mph
Manual: Bevelheaven.com

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