Market Segment:
Performance motorcycle, luxury sport touring.
Competitors:
Moto Guzzi V7 Sport, BMW R75/6, and other large-displacement European motorcycles of the era.
Design Philosophy:
Emphasis on distinctive Italian design, V-twin engine architecture, and sporty performance.
Model Differentiation:
GT featured clip-on handlebars and rear-set footpegs for a sportier stance, while GTS offered higher handlebars and more relaxed ergonomics.
Covered Models:
Ducati 860 GT, Ducati 860 GTS
Covered Years:
1975, 1976
Page Count:
Detailed page count not specified, but comprehensive.
Manual Type:
Full Service and Repair Manual
Format:
Likely Printed Book (typical for this era of manual)
Engine Overhaul:
Complete engine disassembly, inspection, reassembly, and tuning.
Fuel System:
Carburetor (Dell'Orto VHB 30/A) maintenance, adjustment, and overhaul; fuel tank and lines.
Ignition System:
Points ignition system diagnosis, timing, and maintenance.
Transmission And Drivetrain:
Clutch operation and adjustment, gearbox maintenance and repair, final drive and chain maintenance.
Brake System:
Hydraulic brake system service, pad replacement, fluid bleeding, caliper and master cylinder maintenance.
Suspension:
Front fork (Marzocchi) service, seal replacement, oil levels and specifications; rear shock absorber service.
Electrical System:
Wiring diagrams, lighting system, charging system (alternator, rectifier, battery), starter motor, and switches.
Frame And Bodywork:
Chassis inspection, fasteners, body panel removal and installation.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, spark plug replacement, lubrication points.
Troubleshooting:
Diagnostic procedures for common starting, running, and electrical issues.
Engine Rebuild:
Piston removal/installation, cylinder honing, valve seat grinding, crankshaft bearing service.
Carburetor Tuning:
Detailed instructions for synchronizing and adjusting Dell'Orto VHB carburetors.
Electrical Component Replacement:
Instructions for replacing coils, voltage regulators, switches, and lighting.
Brake System Overhaul:
Complete rebuild procedures for brake calipers and master cylinders.
Depth:
Comprehensive, covering routine maintenance to complete engine and transmission rebuilds. Suitable for experienced home mechanics and professional technicians.
File Format:
Assumed printed format, non-digital.
Print Quality:
Typically good quality, with clear diagrams for its era.
Binding Type:
Likely stitched and glued spine for durability in a workshop environment.
Paper Type:
Durable paper stock suitable for workshop use.
Engine Type:
Air-cooled, 90-degree V-twin (L-twin)
Displacement:
797 cc (48.6 cubic inches)
Bore X Stroke:
88 mm x 66 mm
Compression Ratio:
9.0:1 (approximate)
Valve Train:
2 valves per cylinder, overhead camshaft (driven by bevel gears)
Horsepower:
Approximately 60 hp @ 6,500 rpm
Torque:
Approximately 70 Nm (52 lb-ft) @ 5,000 rpm
Top Speed:
Approximately 185 km/h (115 mph)
Carburetors:
2 x Dell'Orto VHB 30/A
Fuel Type:
Unleaded gasoline (minimum 91 octane recommended)
Oil Capacity:
Approximately 3.0 liters (3.2 US quarts) with filter change.
Oil Type:
API SG or higher, SAE 20W-50 recommended for most climates.
Ignition Type:
Battery and Coil, Contact Breaker Points
Spark Plugs:
Bosch W 260 T35 / Champion N3G (check manual for exact application)
Oil Change Interval:
Every 3,000-5,000 km (2,000-3,000 miles) or annually.
Valve Clearance Check:
Every 6,000 km (4,000 miles) or as per manual.
Chain Adjustment Lubrication:
Every 1,000 km (600 miles) or as needed.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (check specific manual recommendation).
Fork Oil Type:
SAE 10W fork oil.
Fork Oil Capacity:
Approximately 190-200 cc per leg (check specific manual for exact volume and level).
Engine Wear:
Desmodromic valve gear (on some Ducati models of this era, though not standard 860) required meticulous adjustment; standard valve train requires diligent clearance checks. Potential for cam drive wear over time.
Electrical Reliability:
Original electrical components (rectifier, voltage regulator) can be prone to failure; upgrades are often recommended.
Carburetor Maintenance:
Dell'Orto carburetors require regular cleaning and adjustment to maintain optimal performance.
Frame Cracks:
While less common on the 860 compared to some other models, stress cracks around the steering head or engine mounts can occur on high-mileage or heavily ridden machines.
Brand Legacy:
Ducati is renowned for its Italian engineering, performance-focused motorcycles, and racing heritage.
Predecessor:
Evolved from the earlier Ducati 750 models, incorporating larger displacement and updated styling.
Design Influence:
Styled by Giorgetto Giugiaro, known for his automotive design work.
Production Period:
1975-1976
Manufacturing Location:
Bologna, Italy
