Ducati ST2 1993 Workshop Manual (P/N 914.7.018.1A)

This Ducati factory workshop manual covers the ST2 and carries P/N 914.7.018.1A, printed 01/1998. It covers maintenance, mechanical repair, chassis service, and the Marelli injection-ignition and electrical systems.

PDF Bookmarks and Wiring Detail

Search, navigation and diagram detail: Embedded bookmarks provide access to the contents and main sections. PDF text search is not available. Small wire-color codes and connector numbers in the wiring diagrams require zooming to read clearly.

One printable Italian/English PDF with 247 pages, including one additional front cover. The printed manual runs from pages 1–246; that numbered section and the additional cover are already included in the total.

Desmodromic Engine, Marelli Injection and Chassis Repair

These selected workshop topics outline the repair coverage rather than reproduce the full contents. Other subjects include exhaust-system removal and fuel-level sensor replacement.

• Engine and valvetrain: Step-by-step engine removal, teardown and reassembly, cylinder-head repair, valve-clearance adjustment, timing-belt service, and final timing checks.

• Clutch and gearbox: Dry-clutch dismantling and reassembly, primary-drive removal, gearbox-shaft disassembly, gear and selector-fork inspection, shimming, and engagement checks.

• Marelli injection and ignition: ECU operating strategy, fuel and air circuits, sensor descriptions, EPROM replacement, throttle-body synchronization, and idle-mixture adjustment.

• Showa suspension and steering: Front-fork removal and overhaul, damping and preload adjustment, rear-shock spring replacement, swingarm and linkage service, and steering-head bearing replacement.

• Brembo brakes and running gear: Pad and disc inspection, brake and clutch fluid replacement and bleeding, wheel service, chain and sprocket replacement, and cush-drive inspection.

• Electrical tests and diagrams: Vehicle wiring and injection-ignition schematics, component legends, charging-system coverage, switch and relay tests, and harness-routing views.

Written for Ducati authorized service centers and workshop personnel performing motorcycle maintenance and repair, this manual assumes workshop knowledge and access to the specified equipment.

Engine Overhaul and Desmodromic Timing

Internal repair covers cylinders and pistons, connecting rods and crankshaft, valve guides and seats, opening and closing rocker arms, and camshafts. Inspection data distinguish serviceable components from worn parts, including cylinder size-class matching and the replacement requirements for damaged silicon-carbide-lined cylinders.

Desmodromic service includes shim selection, belt and pulley installation, tension adjustment, and valve-timing verification after major component replacement. Main-bearing replacement and crankshaft shimming receive separate treatment.

Motorcycle and engine disassembly-sequence charts show which assemblies must be removed to reach a component. Special-tool tables identify TDC gauge 88765.0968, closing-rocker spring tool 88713.0143, and timing-belt tensioner 88713.1215, allowing a shop to check fixture requirements before teardown.

Clutch Diagnosis and Transmission Inspection

The clutch section separates possible causes of drag, slip and noise before internal inspection. Repair information covers the plate stack, housing, cush-drive hub and release mechanism.

Gearbox inspection extends to engagement dogs, bearings, selector forks and drum grooves. End-float specifications and shaft-shimming calculations support reassembly and the subsequent gear-selection checks.

Lubrication and Cooling Service

Oil and filter changes are supported by hot- and cold-engine oil-pressure checks, a lubrication-circuit schematic, and oil-pump clearance inspections. Cooling coverage includes coolant replacement, radiator and hose inspection, and water-pump bearing and mechanical-seal replacement.

Marelli Setup and Diagnostic Requirements

The I.A.W. 1.6 M chapter explains Alfa/N control, sequential injector operation, injection timing and ignition advance. Inputs include engine speed and TDC position, throttle position, absolute pressure, intake-air and coolant temperatures, and battery voltage. Fuel-pump, pressure-regulator and intake-air circuit descriptions explain how the components work together.

Throttle-body setup combines potentiometer positioning, airflow balancing and CO adjustment using MATHESIS, a mercury-column vacuum gauge and a CO tester. The adjustments interact, so the manual treats the throttle body as a calibrated assembly. A separate intake-manifold note addresses the Swiss-version restriction diaphragms.

Diagnostic scope: Detailed injection-ignition component and harness testing follows the separate instructions supplied with the MATHESIS tester; that tester manual is not included. The tool table lists MATHESIS versions 88765.1068–1072.

The EPROM replacement notes address chip orientation and insertion tooling because incorrect fitting can damage the component.

Fork, Rear Suspension and Brake Service Limits

The front-fork exploded view supports cartridge removal, bushing and seal replacement, oil service, and reassembly. The damper cartridge is not opened. Seal-orientation and edge-protection cautions address the risk of damaging the oil-seal lip during installation.

Showa seal tool 88713.0960 and spacer tool 88713.0957 are listed. Rear-shock work distinguishes fixed-position and threaded preload-ring arrangements and covers removal, spring replacement and external inspection. Swingarm pivots, linkage bearings, steering bearings and frame-dimension checks are also covered.

Brake caliper and master-cylinder service is limited to pads, retaining components and bleed components rather than internal hydraulic rebuilding. Wheel procedures include bearing replacement, spindle and rim checks, rear cush-drive inspection, and refitting checks.

Electrical Equipment and Workshop References

Electrical coverage includes battery activation and recharging, the alternator and rectifier-regulator, starter connections, spark plugs, handlebar and ignition switches, lighting relays and the starter contactor. Harness-routing views show cable paths and fastening points for reassembly.

Reference tables supply component-specific torques, fluid capacities, approved products, clearances and wear limits.

Support the motorcycle and engine securely, follow the manual’s fuel and cooling-system warnings, and use the specified equipment for brake, steering, timing and spring-loaded suspension work. Repairs beyond the technician’s training require qualified assistance.

Examples of Compression and Sensor Specifications

For compression testing under the specified warm-engine, full-throttle conditions, the manual gives a standard range of 9–11 bar, a minimum of 8 bar, and a maximum difference of 2 bar between cylinders.

The engine speed/timing sensor section specifies a 0.6–0.8 mm air gap between the sensor tip and the timing-gear teeth, with adjustment information in the engine reassembly chapter.