Engine Components:
Cylinder heads, pistons, crankshaft, con-rods, valve train, oil pump, water pump, intake manifold, exhaust system, engine mounting hardware.
Fuel System:
Fuel tank, fuel pump, fuel filter, fuel injectors, throttle body assembly, fuel lines, regulators.
Transmission Clutch:
Gearbox components (gears, shafts, selectors), clutch assembly (plates, springs, housing), primary drive, final drive chain/sprockets.
Chassis Frame:
Frame sections, sub-frame, swingarm, steering head assembly, footpegs, stands, fasteners.
Suspension Front:
Front fork components (stanchions, sliders, seals, springs, damping rods), triple clamps, steering bearings.
Suspension Rear:
Monoshock absorber, linkage system, swingarm pivot bearings, rear wheel spindle.
Brakes Front:
Brake calipers, discs, master cylinder, brake lines, levers, pads, fasteners.
Brakes Rear:
Rear brake caliper, disc, master cylinder, brake line, lever, pads, fasteners.
Wheels Tires:
Front and rear wheel assemblies, spokes, nipples, rim strips, valve stems, wheel bearings, spacers.
Electrical System:
Wiring harness, battery, starter motor, alternator, ignition coils, CDI unit, lights (headlight, taillight, indicators), switches, fuses, relays, dashboard instrumentation.
Bodywork Fairings:
Front fairing, side panels, belly pan, seat cowl, tank cover, mudguards, windscreen, mounting brackets, fasteners.
Controls Cables:
Throttle controls, clutch lever, brake levers, cables, pushrods, linkages, gear shift mechanism.
Accessories Options:
May include parts for factory-fitted accessories, though primary focus is stock components.
Part Identification:
Identification of all individual parts and assemblies with corresponding part numbers.
Assembly Disassembly:
Illustrations and diagrams showing how components fit together for assembly and disassembly guidance.
Part Replacement:
Implicitly covers part replacement by providing correct part numbers and visual references.
Fastener Specifications:
Identification of specific bolts, nuts, washers, and their associated quantities.
Depth Level:
Detailed component level breakdown. Primarily for parts identification and procurement, not step-by-step repair procedures.
Engine Type:
90° L-Twin, four-stroke, Desmodromic valve actuation
Displacement:
916 cc (for ST4s) / 996 cc (for ST4s ABS)
Bore X Stroke:
98 x 63.2 mm
Compression Ratio:
11.3:1
Valve Train:
Desmodromic, 4 valves per cylinder
Cooling System:
Liquid-cooled
Horsepower Claimed:
Approximately 117 hp @ 9000 rpm
Torque Claimed:
Approximately 9.5 kgm (93 Nm) @ 7000 rpm
Fuel Delivery:
Weber Marelli electronic fuel injection
Fuel Type:
Unleaded gasoline, minimum 95 RON
Oil Type:
Fully synthetic motorcycle oil, SAE 10W-40 or 20W-50, meeting API SG or higher, JASO MA.
Oil Capacity:
Approx. 3.8 liters (with filter change)
Oil Change Interval:
Typically every 7,500 km (4,500 miles) or annually, whichever comes first.
Desmo Service Interval:
Crucial Desmodromic valve clearance check and adjustment typically every 10,000-12,000 km (6,000-7,500 miles).
Spark Plug Replacement:
Refer to manual, typically around 10,000-15,000 km.
Belt Replacement Interval:
Crucial timing belt replacement every 2 years or 20,000 km, due to Desmo timing.
Coolant:
Ethylene glycol-based coolant with anti-corrosion additives, 50/50 mix with distilled water.
Fork Oil:
Refer to specific manual or workshop data for type and viscosity (e.g., SAE 7.5 or 10).
Desmo Service Importance:
Neglecting Desmodromic valve adjustments can lead to valve damage and performance loss. Critical maintenance item.
Electrical Connections:
Some Ducati models of this era can experience issues with corroded electrical connectors, particularly in exposed areas.
Fuel Pump Reliability:
Early fuel pumps could be a point of failure; replacement with updated units may be advisable.
Regulator Rectifier:
While less common than later models, voltage regulator/rectifier issues can occur, leading to battery charging problems.
Fairing Vibrations:
Some owners report minor fairing vibrations at certain RPMs; often addressed by checking fairing mounting points and fasteners.
Engine Oil Filter Example:
Example part number: 444.1.016.1A (check manual for definitive)
Timing Belt Example:
Example part number: 779.1.022.1A (check manual for definitive)