| Manufacturer | Ducati |
|---|---|
| Production | 2002-2005 |
| Predecessor | ST2/ST4 |
| Successor | ST3/ST3s |
| Class | Sport touring |
| Engine | 996 cc L-twin, Fuel-Injected, 4 desmodromic valves per cylinder, liquid-cooled |
| Power | 86 kW (115 hp) @ 8,750 rpm |
| Torque | 98 N·m (72.3 lb·ft) @ 7,000 rpm |
| Transmission | 6-speed |
| Wheelbase | 1,430 mm (56.3 in) |
| Seat height | 820 mm (32.3 in) |
| Weight | 212 kg (467 lb) (2002-2003), 201 kg (443 lb) (2004-2005) (dry) |
| Fuel capacity | 21 l (4.6 imp gal; 5.5 US gal) |
The Ducati ST4s was a sport-touring motorcycle manufactured by Ducati between 2002 and 2005.
Contents |
The ST4s used the liquid-cooled Desmoquattro (four desmodromic valves) engine based on the Ducati 996. The Desmoquattro was largely unchanged from the 996 Super-Bike, and retained a valve angle of 40°, but lost 4 mm of diameter on each of the intake throttle bodies (down from 54 mm on the 996). Chassis clearances also required the use of the more compact cylinder head design that was shared with the 748 Super-Bike and Monster S4. In spite of the smaller intakes, the ST4s actually made slightly more power and torque than the 996 Super-Bike due to the mostly straight-through design of the ST's exhaust, compared to the under-seat exhaust of the Super-Bike.
The chassis design was based on the ST4 but with the larger engine, and improved suspension. Otherwise it was a competent trellis framed sports tourer with a protective fairing, and standard colour matched luggage (luggage was optional on other ST series models). The ST came equipped with a center-stand, an accessory power outlet, and both the ST4s and ST3s could also be equipped with ABS from 2003.
In 2004, an upgrade to the ST line brought a slightly redesigned nose fairing and dashboard, adjustable ergonomics, a trip computer, four-way (hazard) flashers, digital speedometer, a dashboard-controlled adjustable headlight, a new seat design, Euro-2 catalytic exhaust (except USA - Euro-3 was achieved in the 2006 ST3), and a simplified CAN-bus wiring setup. The refinements reduced weight by 11 kg (24 lb) due to the lighter wiring harness and simpler support structure for the nose of the bike.
The trip computer, which was fitted from 2004, could calculate the following:
In 2004 and 2005, Ducati added a wet clutch to many models, including the ST series in 2005. This reduced the force necessary to engage the clutch.[1][2]
Engine
Transmission
Chassis and suspension
Wheels, brakes and tyres
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