🏷️ Basic Information

Make:

Ducati

Model:

860 GT / GTS

Year:

1975-1976

Chassis Code Gt:

860 GT

Chassis Code Gts:

860 GTS

👋 Introduction

Positioning:

The Ducati 860 series represented a significant step in Ducati's evolution, bridging the gap between their earlier bevel-drive twins and the sportier models. It offered a more comfortable and versatile riding experience, targeting riders who appreciated performance and Italian engineering in a more accessible package.

Competitors:

Competed with models from Moto Guzzi (like the V7 Sport and later models), BMW (R-series twins), and various Japanese manufacturers offering larger displacement motorcycles. Its unique V-twin configuration and styling set it apart.

Engine Configuration:

Air-cooled 90-degree V-twin engine.

Styling:

Distinctive styling, often featuring a more integrated bodywork design compared to earlier Ducati twins, and the iconic Ducati 'fuel tank' shape. The GTS model featured a slightly sportier fairing and dual disc front brake.

Handling:

Designed for good road manners, combining performance with a degree of touring capability.

📋 Manual Details

Engine:

Yes

Transmission:

Yes

Frame And Suspension:

Yes

Electrical System:

Yes

Fuel System:

Yes

Braking System:

Yes

Clutch:

Yes

Bodywork And Trim:

Yes

Troubleshooting:

Yes

Maintenance Procedures:

Yes

Estimated Pages:

200+

Type:

Factory Service Repair Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine Overhaul:

Detailed procedures for disassembly, inspection, repair, and reassembly of the V-twin engine.

Carburetion:

Specific tuning and maintenance for Dell'Orto carburetors (e.g., PHM 40). Includes jetting information and troubleshooting.

Ignition System:

Covers ignition timing, spark plug specifications, coil testing, and breaker point adjustment.

Electrical Schematics:

Comprehensive wiring diagrams for all electrical components, including lighting, charging system, and instrumentation.

Transmission And Clutch:

Details on gear selection, clutch operation, clutch plate replacement, and transmission oil specifications.

Front Fork And Suspension:

Information on Marzocchi front forks, including oil levels, seals, and adjustment procedures.

Rear Shock ABSorbers:

Covers rear suspension setup and maintenance, including any adjustable features.

Braking System:

Detailed instructions for servicing front and rear brakes (likely drum or early disc systems), including fluid changes and pad wear.

Wheel Hubs And Bearings:

Procedures for wheel bearing inspection, lubrication, and replacement.

Frame And Chassis:

Inspection and maintenance of the frame, including steering head bearing adjustment.

Routine Maintenance:

Oil changes, filter replacement, chain adjustment, carburetor synchronization, spark plug checks, and brake adjustments.

Engine Rebuild:

Complete overhaul of the 860cc V-twin engine, including piston ring replacement, valve lapping, and gasket renewal.

Carburetor Overhaul:

Detailed steps for dismantling, cleaning, and reassembling Dell'Orto carburetors, including float height adjustment.

Electrical Troubleshooting:

Systematic diagnostic procedures for electrical faults, guided by wiring diagrams.

Suspension Service:

Fork seal replacement, damper rod inspection, and rear shock absorber servicing.

Brake System Maintenance:

Bleeding brake lines, replacing brake pads/shoes, and inspecting master cylinders/calipers.

Clutch Adjustment And Replacement:

Steps for adjusting clutch cable tension and replacing clutch friction plates.

Wheel Truing And Spoke Tensioning:

Guidance on maintaining the integrity and true running of the spoked wheels.

Depth:

Comprehensive, covering everything from basic adjustments to full engine and gearbox rebuilds.

📊 Manual Specifications

Digital Format:

PDF

Quality:

High-resolution scans suitable for printing or on-screen viewing. Clear text and legible diagrams.

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

Text Search:

Yes (Searchable PDF)

⚙️ Engine Specifications

Type:

Air-cooled, 90-degree V-twin, four-stroke

Displacement:

860 cc (860 cm³)

Bore X Stroke:

90 mm x 68 mm

Compression Ratio:

9.5:1 (typical, may vary slightly by market/year)

Valve Train:

Desmodromic, pushrod actuated, two valves per cylinder

Horsepower Approx:

60-65 HP @ 6500-7000 RPM (claimed, varies by source and tuning)

Torque Approx:

70-75 Nm @ 5000 RPM (claimed, varies by source)

Carburetors:

2 x Dell'Orto PHM 40 CD (or similar variant)

Fuel Type:

Unleaded gasoline (typically 95 RON or higher)

Oil Capacity:

Approx. 2.5 - 3.0 liters (total system capacity)

Oil Specification:

API SG/SH or higher, SAE 20W-50 or 10W-40 (consult manual for specific recommendations)

🔧 Transmission

Type:

5-speed constant mesh gearbox

Optional Gearbox:

N/A (5-speed standard)

Clutch Type:

Wet, multi-plate

Final Drive:

Chain drive

Gearbox Oil Capacity:

Approx. 1.5 liters

Gearbox Oil Specification:

API GL-4 SAE 80W-90 (or similar recommended gear oil)

📐 Dimensions

Length:

Approx. 2150 mm (Varies slightly by model/body style)

Width:

Approx. 800 mm (Varies slightly)

Height:

Approx. 1150 mm (Varies slightly)

Dry Weight:

Approx. 200-215 kg (Dry, varies by model)

Wet Weight:

Approx. 220-235 kg (Wet, estimated)

Fuel Tank Capacity:

Approx. 15-18 Liters

Front Wheel Size:

19-inch wire spoke

Rear Wheel Size:

18-inch wire spoke

Front Tire Size:

3.50-19 (Typical)

Rear Tire Size:

4.00-18 (Typical)

Front Brakes:

Single or Dual Disc (GTS typically dual, GT typically single) with hydraulic actuation.

Rear Brakes:

Drum brake with mechanical actuation.

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycles of this era were not subject to standardized crash testing like cars).

Handling Stability:

The 90-degree V-twin configuration contributes to a balanced chassis and predictable handling.

Braking Performance:

Dual front discs on the GTS model offered significantly improved stopping power over the single disc GT. Maintenance of the braking system is critical.

Lighting:

Standard headlight, taillight, brake light, and turn signals. Visibility is crucial for rider safety.

Frame Integrity:

Robust steel tube frame designed to withstand riding stresses.

💡 Technology Features

Infotainment System:

N/A (Basic instrumentation only - speedometer, tachometer, neutral indicator, oil pressure light).

Electronic Aids:

None. This era of motorcycle relies solely on rider skill and mechanical systems.

Headlight Type:

Halogen bulb (typical for the era).

🔧 Maintenance

Oil Change Interval:

Every 5,000 km or 1 year (whichever comes first), using quality motorcycle oil.

Spark Plug Check Interval:

Every 5,000 km

Valve Clearance Check Interval:

Every 10,000 km (critical for desmodromic engines)

Carburetor Sync Interval:

Every 10,000 km or as needed for smooth running.

Chain Lubrication And Adjustment:

Every 1,000 km and after washing or riding in wet conditions. Adjust tension to specified free play.

Engine Oil:

API SG or higher, SAE 20W-50 (or 10W-40 depending on climate, consult manual)

Gearbox Oil:

API GL-4 SAE 80W-90

Brake Fluid:

DOT 3 or DOT 4 (check reservoir cap or manual, ensure correct type for hydraulic system)

Fork Oil:

Specific weight fork oil (e.g., SAE 5W or 10W), capacity as per manual (e.g., 150-200 ml per fork leg)

Electrical Reliability:

Wiring loom can degrade over time, leading to intermittent electrical faults. Connections may corrode.

Desmodromic Valve Adjustment:

Requires specialized knowledge and tools; incorrect adjustment can cause engine damage.

Carburetor Tuning:

Dell'Orto PHMs can be finicky; require precise synchronization and jetting for optimal performance and fuel economy.

Frame Corrosion:

Steel frames can be susceptible to rust, especially in high-humidity environments. Regular inspection and treatment are recommended.

Starting Issues:

Can sometimes be attributed to ignition system components (points, coils) or carburetor settings.

📚 Vehicle History

Heritage:

Ducati, founded in 1926, has a long and storied history in motorcycling, particularly known for its L-twin (and later V-twin) engines, racing success, and distinctive Italian design.

Predecessors:

The 860 series evolved from earlier Ducati twin-cylinder models like the 750 GT and 750 Sport, which established the V-twin platform. It introduced a larger displacement and refined styling.

Successors:

The 860 platform paved the way for later Ducati models, influencing the development of the 900SS, 900 Monster, and other V-twin variants that became synonymous with the brand.

Designer:

Giorgio Farneti (engine), Fabio Taglioni (concept and bevel drive system legacy)

Production Years:

Approximately 1974-1977

Manufacturing Location:

Bologna, Italy

Variants:

860 GT (standard), 860 GTS (Sport, often with dual front discs and different fairing/seating).

🏆 Awards & Recognition

Historical Significance:

While not receiving specific 'awards' in the modern sense, the 860 series is recognized by enthusiasts as a significant and stylish machine that cemented Ducati's reputation for performance V-twins.