Ducati ST3

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

ST3

Manufacturer	Ducati
Production	2004-2007
Predecessor	ST2/ST4
Class	Sport touring
Engine	L-twin, Double Spark, 3 desmodromic valves per cylinder, liquid cooled
Power	75 kW (101 hp) @ 8,750 rpm
Torque	93 N·m (69 lbf·ft) @ 7,250 rpm
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) 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

^{[1] [2] [3] [4] [5] [6] [7] [8]}

Engine

• Layout: Transverse, liquid-cooled 90° L-twin, chain-driven DOHC, desmodromic 3V, 992 cc.
• Bore x stroke: 94.0 × 71.5 mm (3.70 × 2.81 in)
• Valves^[9]:
  • 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.

References

1. ^ "Ducati.com, 2004 ST3 Chassis Specs". http://www.ducati.com/bikes/my2004/ducatiModel.jhtml?part=chassis&modelName=ST3-04. 
2. ^ "Ducati.com, 2004 ST3 Engine Specs". http://www.ducati.com/bikes/my2004/ducatiModel.jhtml?part=engine&modelName=ST3-04. 
3. ^ "Ducati.com, 2005 ST3 Chassis Specs". http://www.ducati.com/bikes/my2005/chassis.jhtml?family=sporttouring&modelName=ST3-05. 
4. ^ "Ducati.com, 2005 ST3 Engine Specs". http://www.ducati.com/bikes/my2005/engine.jhtml?family=sporttouring&modelName=ST3-05. 
5. ^ "Ducati.com, 2006 ST3 Engine and Chassis Specs". http://www.ducati.com/bikes/my2006/popup_tech_spec.jhtml?modelName=ST3-06. 
6. ^ "Ducati.com, 2006 ST3S ABS Engine and Chassis Specs". http://www.ducati.com/bikes/my2006/popup_tech_spec.jhtml?modelName=ST3SABS-06. 
7. ^ "Ducati.com, 2007 ST3 Engine and Chassis Specs". http://www.ducati.com/en/bikes/my2007/popup_tech_spec.jhtml?modelName=ST3-07&content=Bikes&sub_content=MY2007;%20Sporttouring;%20ST3-07. 
8. ^ "Ducati.com, 2007 ST3S ABS Engine and Chassis Specs". http://www.ducati.com/en/bikes/my2007/popup_tech_spec.jhtml?modelName=ST3SABS-07&content=Bikes&sub_content=MY2007;%20Sporttouring;%20ST3SABS-07. 
9. ^ Workshop Manual Model Year 2004 ST3, Section C 1.1, Page 11

External links