Target Audience:
Owners, technicians, and restorers of Ducati 860 GT and GTS models.
Value Proposition:
Provides essential information for maintaining, repairing, and restoring these classic Italian motorcycles, ensuring longevity and performance.
Content Overview:
Covers all mechanical and electrical systems with detailed diagrams and step-by-step instructions.
Engine:
Complete overhaul, tuning, carburation, ignition system, lubrication
Transmission:
Clutch operation, gearbox disassembly/assembly, final drive
Chassis:
Frame, suspension (front forks, rear shock absorber), steering, wheels, brakes (front and rear drums/discs depending on model variant)
Electrical:
Wiring diagrams, lighting, ignition, charging system, starter motor
Bodywork:
Fuel tank, seat, fenders, instrumentation
Fuel System:
Fuel tank repair, petcock servicing, fuel line inspection and replacement.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, brake adjustments, spark plug replacement
Troubleshooting:
Diagnostic procedures for common issues, electrical faults, engine performance problems
Repair And Rebuild:
Detailed instructions for component disassembly, repair, and reassembly (e.g., engine rebuild, gearbox overhaul, brake caliper servicing)
Suspension Servicing:
Detailed instructions for servicing front forks (e.g., oil changes, seal replacement) and rear shock absorber adjustments/rebuild.
Level Of Detail:
Comprehensive, suitable for experienced mechanics and skilled DIY enthusiasts. Includes torque specifications, clearances, and detailed diagrams.
Diagnostic Procedures:
Includes methods for diagnosing ignition timing issues, fuel delivery problems, and mechanical wear.
Torque Specifications:
Provides critical torque values for engine fasteners, suspension components, and wheel hubs.
Engine Type:
Air-cooled, 90-degree L-twin (V-twin)
Displacement:
736 cc (736 cm³)
Bore X Stroke:
80 mm x 73 mm
Valve Train:
Desmodromic, 2 valves per cylinder (pushrod actuated)
Horsepower Est:
Approx. 60-65 hp @ 6500 rpm
Torque Est:
Approx. 70 Nm @ 5000 rpm
Carburetors:
2 x Dell'Orto PHF 32A or PHM 32A
Fuel Type:
Unleaded gasoline (minimum 91 RON)
Ignition System:
Breaker points (later models may have electronic ignition upgrades)
Oil Capacity:
Approx. 2.5 - 3.0 liters (including filter)
Oil Type:
API SG or higher, SAE 20W-50 or 10W-40 (refer to manual for specific recommendations)
Safety Features:
Primarily passive safety inherent to motorcycle design (e.g., frame integrity). Active safety relies on rider skill and proper maintenance.
Braking System:
Hydraulic disc front, drum or disc rear depending on variant. Spoked or cast alloy wheels.
Lighting:
12V Halogen headlight, taillight, brake light, turn signals.
Oil Change Interval:
Every 3,000 - 5,000 km (approx. 1800 - 3000 miles) or annually.
Valve Clearance Check:
Every 6,000 - 10,000 km (approx. 3700 - 6200 miles) or as per manual.
Chain Adjustment Interval:
Regularly, every 500-1000 km, or when slack exceeds specification.
Carburetor Sync Tune:
As needed, typically every 6,000 - 12,000 km, or when performance is uneven.
Engine Oil Viscosity:
SAE 20W-50 or 10W-40 (API SG or higher)
Gearbox Oil Viscosity:
SAE 80W-90 (GL-5)
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for exact specification, likely DOT 3 for original spec)
Desmodromic Valve Adjustment:
Can be complex and requires specialized knowledge/tools; often a point of concern for DIY maintenance.
Electrical System Reliability:
Original wiring looms can degrade over time; issues with charging system, ignition switches, and connections are common.
Carburetor Tuning:
Dell'Orto carbs require regular cleaning and tuning to maintain optimal performance.
Frame Corrosion:
Older models may suffer from frame corrosion, especially in areas exposed to moisture.
Engine Oil Leaks:
Gasket and seal degradation can lead to oil leaks, particularly around the crankcases and engine covers.
Manufacturer Origin:
Bologna, Italy
Introduction Year:
1974 (GT), 1975 (GTS)
Design Influence:
Designed by Fabio Taglioni, featuring the signature Ducati L-twin engine layout.
Key Variants:
860 GT (standard), 860 GTS (Sport - often with clip-on handlebars, different seat, and sometimes higher compression)
Production Period:
1974-1979
Notable Design Elements:
Distinctive 'square' engine casing, often referred to as the 'Ducati 860' or 'Bol d'Or' due to its racing heritage.
