The Ducati ST4S, manufactured in 2005-06, is a high-performance sports bike with a liquid-cooled four-stroke engine, a capacity of 996cc, and 117 horsepower at 8750 rpm. The engine is a L-twin cylinder design with dual overhead camshafts and four-valve desmodromic technology. The bike has a six-speed transmission with a wet multiplate clutch, and a chain drive with a 15-tooth front sprocket and a 38-tooth rear sprocket. The frame is made of tubular steel trellis, and the suspension consists of a fully adjustable upside-down fork and a fully adjustable monoshock with remote control preload adjustment. The bike has anti-lock brakes, with dual 320mm discs and four-piston calipers in the front, and a single 245mm disc with two-piston calipers in the rear. The front and rear wheels are light alloy 5-spoke 17-inch rims, with 120/70ZR17 and 190/50ZR17 tires, respectively. The bike has a top speed of 249 km/h (155 mph), and average fuel consumption of 4.8 L/100 km (50 mpg). The dry weight is 217kg (478 lbs), and the fuel tank has a capacity of 21 litres (5.5 US gallons).
Technical specifications:
Make Model: Ducati ST4S
| Year | 2005 – 06 |
|---|---|
| Engine | Four stroke, 90 degrees L twin cylinder, DOHC, desmodromic 4 valve per cylinder. |
| Capacity | 996 cc / 60.8 cu in |
| Bore x Stroke | 98 x 66 mm |
| Cooling System | Liquid cooled |
| Compression Ratio | 11.5:1 |
| Lubrication | Wet sump |
| Engine Oil | Synthetic, 20W/50 |
| Exhaust | 2 aluminum mufflers with catalytic converter (non-catalytic on USA version) |
| Induction | Fuel injection, 50 mm throttle body |
| Ignition | Marelli electronic |
| Spark Plug | Champion, RA59GC |
| Starting | Electric |
| Battery | 12V 10Ah |
| Max Power | 85.3 kW / 117 hp @ 8750 rpm |
| Max Torque | 98 Nm / 10 kgf-m / 72.2 ft-lb @ 7000 rpm |
| Clutch | Wet multiplate with hydraulic control |
| Transmission | 6 Speed |
| Final Drive | Chain; front sprocket 15; rear sprocket 38 |
| Gear Ratio | 1st 37/15, 2nd 30/17, 3rd 27/20, 4th 24/22, 5th 23/24, 6th 24/28 |
| Primary Drive | Straight cut gears; ratio 1.84:1 (32/59) |
| Frame | Tubular steel trellis |
| Front Suspension | Showa 43 mm fully adjustable upside-down front fork with TiN surface treatment, |
| Front Wheel Travel | 130 mm / 5.1 in |
| Rear Suspension | Progressive linkage with fully adjustable ~Ahlins monoshock with remote control preload adjustment. Aluminium swingarm |
| Rear Wheel Travel | 148 mm / 5.8 in |
| Front Brakes | 2x 320mm discs 4 piston calipers with abs |
| Rear Brakes | Single 245mm disc 2 piston caliper with abs |
| Front Wheel | 5-spoke light alloy 3.50 x 17 |
| Rear Wheel | 5-spoke light alloy 5.50 x 17 |
| Front Tyre | 120/70 – ZR17 |
| Rear Tyre | 190/50 – ZR17 |
| Rake | 24 degrees |
| Dimensions | Length 2070 mm / 81.4 in Width: 910mm / 35.8in Height 1274 mm / 50.2 in |
| Wheelbase | 1430 mm / 56.3 in |
| Seat Height | 820 mm / 32.3 in |
| Dry Weight | 217 kg / 478 lbs |
| Fuel Capacity | 21 Litres / 5.5 US gal / 4.6 Imp gal |
| Consumption Average | 4.8 L/100 km / 20.8 km/l / 50 US mpg / 59 Imp mpg |
| Standing 1/4 Mile | 10.7 sec |
| Top Speed | 249 km/h / 155 mph |
