Segment:
The Ducati ST4s was positioned as a premium sport-touring motorcycle, blending Ducati's signature performance with the comfort and practicality needed for longer journeys.
Competitors:
Competed with other high-performance sport-touring motorcycles of its era, such as the Honda VFR800, Kawasaki GTR1000, and BMW R1100S.
Engine Configuration:
Powered by Ducati's renowned L-twin engine, known for its torque and distinctive character.
Suspension Quality:
Featured premium suspension components, often from Showa, offering excellent adjustability and performance.
Aerodynamics:
Designed for rider comfort at speed with a substantial fairing and windscreen.
Handling:
Combined with Ducati's signature trellis frame, it offered agile and precise handling characteristics.
Engine Operation:
Detailed explanations of engine performance, operation, and cooling system.
Fuel System:
Fuel injection system, fuel tank, pump, and filter operation.
Electrical System:
Battery, charging system, ignition, lighting, and accessory circuits.
ABS System:
Operation, limitations, and basic maintenance of the Anti-lock Braking System.
Chassis And Suspension:
Frame, front fork (e.g., Showa USD), rear shock absorber, and adjustments.
Braking System:
Front and rear brake system, master cylinders, calipers, discs, and fluid.
Cooling System:
Radiator, fan, coolant type and level, and hoses.
Exhaust System:
Catalytic converter, mufflers, and proper operation.
Wheels And Tires:
Tire pressure specifications, wheel removal/installation, and type.
Pre Ride Inspection:
Essential checks before operating the motorcycle.
Controls And Instruments:
Identification and function of all switches, levers, and dashboard indicators.
Fueling Procedure:
Correct fuel type and capacity, safe fueling practices.
Storage Recommendations:
Guidelines for short-term and long-term storage.
Break In Procedure:
Recommended procedures for the initial period of use.
Troubleshooting Guide:
Basic diagnostic steps for common issues (e.g., starting problems, warning lights).
Depth:
Comprehensive owner-level information, focusing on safe operation, routine checks, and basic adjustments. Not a full service manual for complex repairs.
Engine Type:
Four-stroke, 90-degree V-twin (L-twin), Desmodromic, liquid-cooled
Displacement:
996 cc (or 998 cc for some variations)
Bore X Stroke:
Approximately 98 x 66 mm (for 996cc variant)
Compression Ratio:
Typically around 11.3:1
Horsepower:
Around 111 hp (83 kW) at 8,800 rpm (claimed)
Torque:
Around 71.5 lb-ft (97 Nm) at 6,700 rpm (claimed)
Fuel Delivery:
Weber Marelli Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline, minimum 95 RON (octane rating)
Oil Type:
Synthetic motorcycle oil, e.g., API SG/SH/SJ, JASO MA certified, viscosity 10W-40 or 15W-50
Oil Capacity:
Approx. 3.7 liters (3.9 US qt) with filter change.
Transmission Type:
6-speed sequential manual
Clutch:
Hydraulically operated, wet multi-plate
Final Drive:
Chain drive (525 pitch O-ring sealed chain)
Gear Ratios:
Specific ratios detailed in service manual, but optimized for a balance of acceleration and touring.
Transmission Oil:
Gear oil specified by Ducati (often SAE 75W-90, GL-4)
Length:
Approx. 2,130 mm (83.9 in)
Width:
Approx. 760 mm (29.9 in) at handlebars
Height:
Approx. 1,230 mm (48.4 in) at windscreen
Wheelbase:
Approx. 1,470 mm (57.9 in)
Seat Height:
Approx. 820 mm (32.3 in)
Dry Weight:
Approx. 206 kg (454 lbs)
Wet Weight:
Approx. 231 kg (509 lbs) with fluids and ready to ride
Fuel Tank Capacity:
21 liters (5.5 US gallons)
Safety Features:
Equipped with an Anti-lock Braking System (ABS) for enhanced braking control, particularly in adverse conditions.
Braking Performance:
Dual 320mm discs with 4-piston radial calipers (Brembo) at the front, 270mm disc with 2-piston caliper at the rear.
Lighting:
Halogen headlight, taillight, and turn signals for visibility.
Frame Construction:
Ducati's signature tubular steel trellis frame provides rigidity and safety.
Instrument Cluster:
Analog tachometer, digital speedometer, odometer, trip meters, and warning lights. Basic functionality typical of the era.
ABS System:
Bosch ABS system (on ABS models) integrated into the braking system for enhanced safety.
Connectivity Features:
No modern connectivity features like Bluetooth or smartphone integration. Primarily mechanical and basic electrical systems.
Oil Change Interval:
Typically every 6,000 miles (10,000 km) or 12 months, whichever comes first.
Desmo Service Interval:
Desmodromic valve clearance checks and adjustments are critical and typically required every 7,500 miles (12,000 km).
Major Service Interval:
More comprehensive services, including belt replacement, are usually recommended at higher mileage intervals.
Brake Fluid:
DOT 4 or DOT 5.1 brake fluid.
Coolant Type:
Ethylene glycol based coolant with anti-corrosion additives, mixed 50/50 with distilled water.
Rectifier Issues:
Some Ducati models of this era experienced issues with the voltage rectifier, leading to charging problems.
Cam Belt Wear:
Regular inspection and replacement of cam belts are crucial to prevent catastrophic engine damage.
Electrical Connections:
Corrosion or loose electrical connections can sometimes lead to intermittent faults.
Air Filter Part Number:
Part numbers vary by manufacturer (e.g., K&N, Ducati Performance). Consult specific parts catalog or manual for exact fitment.
Spark Plugs:
Typically Champion RG4HC or equivalent.
Ducati Legacy:
Ducati has a rich history in performance motorcycles, known for its L-twin engines, desmodromic valve systems, and racing pedigree.
St Series:
The ST series (Sporttouring) represented Ducati's foray into the sport-touring segment, building upon their performance heritage with added comfort and practicality.
St4S Development:
The ST4s was an evolution of the ST4, featuring upgrades like the larger 996cc engine and higher-specification suspension, aiming for increased performance and refinement.
Manufacturing:
Manufactured by Ducati in Bologna, Italy.
Production Years:
The ST4s model generally ran from the early 2000s, with the 2004 model being a significant iteration.
Market Reception:
Generally well-received for its performance, handling, and unique character, though often noted for its demanding maintenance requirements.
Comparative Ratings:
Frequently praised in contemporary motorcycle reviews for its engine torque, chassis dynamics, and braking power, especially the ST4s variant.
