Ducati ST3

"ST3" redirects here. For a movie with the same initials, see Starship Troopers 3: Marauder.

ST3

Manufacturer	Ducati
Production	2004-2007
Predecessor	ST2/ST4
Class	Sport touring
Engine	90° V-twin, Double Spark, 3 desmodromic valves per cylinder, liquid cooled
Transmission	6-speed
Wheelbase	1,430 mm (56 in)
Seat height	820 mm (32 in)
Weight	214 kg (470 lb) (dry)
Fuel capacity	21 l (4.6 imp gal; 5.5 US gal)

The ST3 is an Italian sport touring motorcycle that was made by Ducati between 2004 and 2007.

The Ducati ST3 used the liquid cooled Desmotre (three valve desmodromic valve) 90° V-twin engine. The design was aimed at meeting anti-pollution limits. It is a trellis framed sports tourer with a protective fairing, and colour matched panniers.

The Desmotre bottom end was derived from the 1000 DS Desmodue, with the water pump in the alternator cover.

Specifications

Engine

• Layout: Transverse, liquid-cooled 90° V-twin, belt-driven SOHC, desmodromic 3V, 992 cc.
• Bore x stroke: 94.0 mm × 71.5 mm (3.70 in × 2.81 in)
• Valves:
  • Intake: 34 mm, 2 per cylinder
  • Exhaust: 40 mm, 1 per cylinder
• Compression ratio: 11.3:1.
• Power:
  • 2004 only: 75 kW (102 PS) @ 8,750 rpm.
  • 2005-2007: 78.8 kW (107 PS) @ 8,750 rpm.
• Torque:
  • 2004 only: 93 N·m (9.5 kgf·m) @ 7,250 rpm.
  • 2005-2007: 98.1 N·m (10 kgf·m) @ 7,250 rpm.
• Induction: Marelli electronic fuel-injection with two 50 mm throttle bodies.
• Ignition: Electronic, two spark plugs per cylinder.
• Exhaust:
  • 2004-2005: 2 aluminum mufflers with catalytic converter.
  • 2006-2007: 2 aluminum mufflers with catalytic converter and lambda sensor.
• Emissions:
  • 2004-2005: Euro 2
  • 2006: Euro 3 (except North American version)
  • 2007: Euro 3 (except USA version)
• Starting: Electric with anti-theft immobilizer system using chip embedded in key.
• Instruments: Electronic instrument panel using CAN communication protocol with CPU: multifunctional digital display (including speedometer, clock, oil/water temperature, fuel gauge, instant/average consumption, consumed fuel), analog rev counter, self-adjusting illumination (depending on outdoor light).

Transmission

• Six-speed gearbox with chain final drive.
  • Gear ratios: 1st 37:15, 2nd 30:17, 3rd 27:20, 4th 24:22, 5th 23:24, 6th 24:28.
  • Primary drive ratio: 1.84:1.
  • Final drive ratio: front sprocket 15 T, rear sprocket 42 T.
• Clutch:
  • 2004 only: Dry multiplate with hydraulic control
  • 2005-2007: Hydraulically actuated wet multiplate clutch.

Chassis and suspension

• Frame: Tubular steel trellis
• Wheelbase: 1,430 mm (56.3 in)
• Seat height: 820 mm (32.3 in)
• Weight:
  • 2004: 214 kg (467 lb) including battery, lubricants and cooling liquid.
  • 2005-2006 non-ABS models: 203 kg (447 lb) excludes battery, lubricants and cooling liquid.
  • 2006-2007 ABS models: 204 kg (449 lb) excludes battery, lubricants and cooling liquid.
  • 2007 non-ABS model: 201 kg (443 lb) excludes battery, lubricants and cooling liquid.
• Rake: 24°
• Suspension:
  • Front:
    • 2004-2007 non-ABS models: 43 mm Showa inverted cartridge forks, adjustable for preload
    • 2006-2007 ABS models: 43 mm Showa inverted cartridge forks, TiN-coated, adjustable for preload, compression and rebound damping.
  • Rear:
    • 2004-2007 non-ABS models: Sachs monoshock adjustable for preload, compression and rebound damping.
    • 2006-2007 ABS models: Öhlins monoshock adjustable for preload, compression and rebound damping.

Wheels, brakes and tires

• Wheels:
  • Front:
    • 2004-2007 non-ABS models: 3-spoke light alloy, 3.5 in x 17 in.
    • 2006-2007 ABS models: 5-spoke light alloy, 3.5 in x 17 in.
  • Rear:
    • 2004-2007 non-ABS models: 3-spoke light alloy, 5.5 in x 17 in
    • 2006-2007 ABS models: 5-spoke light alloy, 5.5 in x 17 in
• Tyres:
  • Front: 120/70 ZR17 tubeless
  • Rear: 180/55 ZR17 tubeless
• Brakes:
  • Front: 2 x 320 mm semi-floating discs, Brembo four-piston piston calipers. ABS controlled braking on 2006-2007 ABS models.
  • Rear: 1 x 245 mm disc, Brembo two-piston caliper. ABS controlled braking on 2006-2007 ABS models.