Target Audience:
Mechanics and DIY owners of the 1976 Ducati 860 GT.
Value Proposition:
Provides essential factory-level information to maintain and repair a classic Italian motorcycle, crucial for preserving its value and functionality.
Manual Utility:
Designed as a practical, easy-to-read reference for specific repair and adjustment tasks.
Engine Systems:
Engine disassembly, assembly, tuning, carburetion, ignition system, lubrication, cooling system (air-cooled).
Transmission Drivetrain Systems:
Gearbox operation, clutch, final drive, drive chain maintenance.
Chassis Frame Systems:
Frame inspection, steering head, suspension (front forks, rear shock absorbers), wheel bearings.
Braking Systems:
Hydraulic brake system components, caliper service, master cylinder, brake line inspection, pad replacement.
Electrical Systems:
Wiring diagrams, lighting, instrumentation, battery, charging system (alternator, regulator), ignition coil, starter motor.
Fuel System:
Fuel tank, petcock, fuel lines, carburetor overhaul (likely Dell'Orto).
Exhaust System:
Exhaust pipe inspection, muffler maintenance.
Bodywork Fittings:
Fender, seat, fuel tank mounting, fairing (if applicable), control levers, cables.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, spark plug service, valve clearance adjustment, brake fluid checks.
Disassembly Assembly:
Detailed step-by-step instructions for component removal and reinstallation.
Repair Overhaul:
Instructions for rebuilding carburetors, engine top-end, gearbox components, brake calipers, etc.
Troubleshooting:
Diagnostic guidance for common performance issues and system malfunctions.
Inspection Checks:
Procedures for checking wear, damage, and proper function of various components.
Depth Of Information:
Comprehensive, covering routine maintenance to complete engine and chassis overhauls. Suitable for experienced mechanics and dedicated DIY enthusiasts.
File Format:
N/A (Printed Manual)
Print Quality:
Original factory print quality (may vary based on source reproduction).
Binding Type:
Likely perfect bound or stapled, typical for factory manuals of the era.
Paper Type:
Newsprint or standard paper stock, typical for factory manuals of the era.
Engine Type:
Air-cooled, 90-degree V-twin (L-twin)
Displacement:
796 cc (48.5 cu in)
Bore X Stroke:
80 mm x 79 mm (3.15 in x 3.11 in)
Compression Ratio:
Approximately 8.5:1 (check specific model variation)
Valve Actuation:
Desmodromic valve system
Camshafts:
Single overhead camshaft per cylinder, driven by bevel gears.
Horsepower:
Approximately 60 hp (45 kW) at 7500 rpm (varies slightly by spec)
Torque:
Approximately 43 lb-ft (58 Nm) at 6000 rpm (varies slightly by spec)
Carburetor Type:
Dual Dell'Orto PHF 36mm (or similar specification)
Fuel Type:
Unleaded gasoline (recommended: 91-95 RON)
Ignition Type:
Contact breaker points, dual-fire ignition coil.
Oil Type:
SAE 20W-50 or 10W-40 motorcycle-specific oil (mineral-based typical for era).
Oil Capacity:
Approximately 2.5 liters (2.6 US qt) for engine and gearbox (dry).
Transmission Type:
5-speed sequential manual gearbox
Clutch Type:
Dry multi-plate clutch
Final Drive:
Enclosed shaft drive (bevel gear drive)
Gear Ratios:
Specific gear ratios will be detailed within the manual for accurate maintenance and diagnostics.
Gearbox Oil Type:
Often shared with engine oil (e.g., SAE 20W-50, verify in manual).
Safety Design Considerations:
Focus on rider control and braking effectiveness typical of performance motorcycles of the era. Manual will guide maintenance for optimal safety.
Braking System:
Dual front disc brakes with hydraulic actuation; single rear disc brake with hydraulic actuation.
Suspension:
Telescopic front forks with adjustable preload; dual rear shock absorbers with adjustable preload.
Frame Construction:
Steel frame (typically a duplex cradle frame) for structural integrity.
Instrumentation:
Analog speedometer, tachometer, and warning lights typical of the era. Manual covers their function and maintenance.
ABS Traction Control:
Not applicable for this vintage motorcycle.
Smartphone Integration:
Not applicable for this vintage motorcycle.
Oil Change Interval:
Typically every 3,000-5,000 km (2,000-3,000 miles) or annually. Specific interval to be confirmed in the manual.
Valve Clearance Adjustment:
Likely every 6,000-10,000 km (4,000-6,000 miles). Crucial due to desmodromic system. Manual provides exact procedure and specs.
Carburetor Cleaning Sync:
As needed, or at recommended mileage intervals specified in the manual, especially for optimal performance.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid. Manual will specify.
Fork Oil Type And Level:
Specific viscosity and oil level (measured from the top of the fork tube with the spring removed) detailed in manual.
Electrical Connections:
Corrosion and loose connections in wiring harnesses are common in older motorcycles; manual will help diagnose.
Desmodromic Valve Adjustment:
Requires precision; improper adjustment can lead to engine damage. Manual's detailed instructions are vital.
Carburetor Tuning:
Synchronization and jetting can be sensitive; manual provides factory settings.
Shaft Drive Maintenance:
Regular checking of U-joints and lubrication is important for longevity. Manual will outline procedures.
Ducati Legacy:
Ducati is renowned for its sporting heritage, L-twin engines, and desmodromic valve technology, originating from Bologna, Italy.
860 Gt Context:
The 860 GT was a significant model in Ducati's lineup, featuring a more robust and comfortable touring-oriented design compared to its earlier sportbike predecessors, while retaining the iconic L-twin engine.
Production Period:
The 860 GT model range was produced from approximately 1974 to 1977.
