1975–1977 Ducati 750 SS / 900 SS Desmo Workshop Manual Supplement

This Ducati Meccanica workshop supplement covers the 1975–1977 Ducati 750 SS and 900 SS Desmo, including U.S. electrical configurations. It accompanies the 860 GT/GTS workshop manual, which is required for referenced procedures and is not included in this download. Illustrations include 44 numbered figures and separate wiring diagrams.

• Desmo cylinder heads: Disassembly, valve-guide replacement, valve-seat milling and lapping, rocker inspection, bevel-drive support removal, head reassembly, and tappet adjustment.

• Dell’Orto carburetors: PHM 40 and PHF 32 operation, jetting tables, idle adjustment, accelerator-pump calibration, float-level checks, and component inspection.

• Wheels and chassis: Wheel removal, swingarm inspection and adjustment, chain-tension procedures, dimensioned frame drawings, and illustrated wheel-component listings.

• Brake assemblies: Exploded views and part numbers for front and model-specific rear brakes, including master cylinders, calipers, seals, and control linkages.

• Electrical equipment: Charging-system operation, ignition components, switches, connector identification, and wiring diagrams for standard and U.S. configurations.

• Racing equipment and tools: Uprating-kit component lists, oil-radiator fittings, and factory special-tool illustrations with identifying part numbers.

This supplement suits experienced mechanics who can assess cylinder-head wear and use the specified pullers, assembly pins, and measuring tools.

Desmo Head Repair and Inspection

Head repair covers camshaft removal, timing supports and bevel gears, rocker alignment, and shim selection. Valve-guide and rocker-pin wear tables support component inspection; camshaft support bearings are checked for condition.

Reassembly photographs show special-tool applications, including rocker-pin extractor 88713.0120 and rocker-assembly pin 88713.0262. The instructions distinguish opening- and closing-rocker adjustment, with an engine fastener torque table alongside the tappet section.

PHM and PHF Carburetor Settings

PHM 40 AD/AS carburetors are paired with conical silencers; PHF 32 AD/AS configurations use cylindrical silencers. This distinction helps you select the appropriate settings before checking a carburetor setup.

Circuit cross-sections explain starting, idle, progression, acceleration, and full-throttle operation. Float-level illustrations and separate front/rear jetting tables accompany the adjustment procedures, including measured accelerator-pump delivery checks.

Wheels, Frame, and Brake Assemblies

Wheel assembly drawings identify Borrani light-alloy rims, bearings, sprocket carriers, and cush-drive rubbers. Dimensioned frame drawings distinguish the 1975 and 1976–1977 layouts, while swingarm instructions cover bush and spindle inspection and axial-play adjustment.

Telescopic hydraulic fork specifications are included. Brake drawings identify master cylinders, calipers, and the different rear-brake arrangements; disc-brake maintenance refers to the separate 860 GT/GTS manual.

Support the motorcycle securely on a suitable lift before inspecting chassis components.

Racing equipment: Component lists identify uprating-kit camshafts, jets, raised exhausts, sprockets, and the oil radiator with its mounting parts.

Ignition, Charging, and Wiring Diagrams

Four wiring diagrams cover the 1975, 1975–1976, 1976–1977, and U.S. configurations, with component legends and cable-color keys. The text explains the electronic ignition generator, transducers, alternator, voltage regulator, and U.S. sealed-beam headlamp arrangement.

It also identifies the GEN lamp as an ignition-on indicator that stays lit during operation. The alternator section warns that timing-side cover removal can damage the windings.

Selected Valve-Clearance and Guide-Wear Data

These examples are a small selection of the supplement’s valvetrain specifications.

For the covered Desmo engines, cold opening-rocker clearance is 0.08 mm at the intake and 0.12 mm at the exhaust.

The valve-guide table gives a stem-to-guide working clearance of 0.020–0.052 mm and a wear limit of 0.12 mm.

PDF Navigation, Diagram Condition, and Page Count

Text access and diagram detail: PDF text search and embedded bookmarks are unavailable. Small wiring labels need magnification, and white gaps obscure some circuit details and passages of text; those missing areas remain unreadable when enlarged. The printed pagination skips pages 4 and 9.

One printable 76-page PDF in English and Italian. The total includes 73 pages of manual content plus the front cover, supplement title page, and back cover.