Historical Significance:
The Moto Guzzi 850 Le Mans II is a significant sport-touring motorcycle, a refinement of the iconic 850 Le Mans, known for its distinctive styling and powerful V-twin engine.
Competitors:
Competed against other European sportbikes and sport-tourers of the era, such as BMW R100S, Ducati 900SS, and Kawasaki Z1000.
Design Philosophy:
Emphasized Italian design, shaft drive, and the unique character of Moto Guzzi's transverse V-twin engine.
Engine:
Comprehensive engine overhaul, tuning, and troubleshooting.
Transmission:
Gearbox removal, disassembly, assembly, and adjustments.
Drivetrain:
Cardan shaft, bevel gear maintenance, and adjustments.
Suspension:
Front fork (Giacomo Marzocchi) servicing, rear shock absorber adjustments.
Brakes:
Brake system diagnosis, repair, fluid changes, and component replacement (likely Brembo calipers).
Electrical System:
Wiring diagrams, ignition system, lighting, charging system troubleshooting.
Fuel System:
Carburetor (likely Dell'Orto) tuning, cleaning, and overhaul.
Cooling System:
Air-cooled engine specifications and maintenance.
Frame And Bodywork:
Chassis inspection, component removal/installation, fairing details.
Maintenance:
Scheduled maintenance, fluid level checks, lubrication points.
Troubleshooting:
Systematic diagnostic procedures for common and complex issues.
Repair:
Step-by-step repair instructions for all major components.
Disassembly:
Detailed instructions for taking apart various vehicle systems.
Assembly:
Comprehensive guidance for reassembling components.
Adjustments:
Valve clearance, ignition timing, carburetor synchronization, clutch and brake lever adjustments.
Installation:
Guidance for fitting new or replacement parts.
Depth:
Comprehensive, bumper-to-bumper coverage suitable for both professional mechanics and experienced DIY enthusiasts.
Illustrations:
Detailed pictorial diagrams, exploded views, drawings, and photographs.
Special Tools:
Reference to required special service tool numbers and their usage.
Specifications:
Service data, factory specifications, allowable limits, and wear limits.
Torque Values:
Specific torque values for critical fasteners.
Printability:
Yes, all pages are printable.
Resolution:
High-quality, suitable for clear printing.
Binding:
Digital (PDF) - no physical binding.
Paper Type:
N/A (digital format).
Operating Systems:
Windows, Mac OS, Linux OS.
Required Software:
Adobe Reader or compatible PDF viewer.
Engine Type:
Air-cooled, four-stroke, 90-degree V-twin
Displacement:
844 cc (approximately)
Bore X Stroke:
90 mm x 66 mm (typical for this engine family)
Valve Actuation:
Pushrod-operated overhead valves (OHV), 2 valves per cylinder
Compression Ratio:
9.2:1 (typical)
Horsepower:
Approx. 77-80 hp @ 7000 rpm (estimated)
Torque:
Approx. 56 lb-ft @ 5500 rpm (estimated)
Carburetion:
Twin Dell'Orto PHM 40 C (or similar 40mm carburetors)
Fuel Type:
Unleaded gasoline (recommendation for modern fuels may differ, check manual for specifics)
Safety Features:
Integral braking system (potential for linked front/rear brakes, though less common on this specific model variant compared to some others), robust frame construction.
Active Safety:
Responsive handling, effective braking (typically dual front discs, single rear).
Passive Safety:
Durable construction, protective fairing (depending on specific model configuration).
Oil Change Interval:
Typically every 3,000-5,000 km (refer to manual for exact intervals).
Valve Adjustment Interval:
Generally every 6,000-10,000 km (critical for performance and longevity).
Engine Oil Type:
SAE 20W-50 or similar viscosity motorcycle-specific oil (check manual for exact specification).
Gearbox Oil Type:
Specific gearbox oil (e.g., SAE 80W-90 GL-5 or similar, consult manual).
Final Drive Oil Type:
Hypoid gear oil (e.g., SAE 80W-90 GL-5, consult manual).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (depending on caliper specification, verify in manual).
Common Wear Items:
Clutch plates, valve guides, camshaft lobes, electrical connections, starter motor brushes.
Potential Problems:
Carburetor synchronization issues, oil leaks from seals, ignition system component failures, exhaust header leaks.
Moto Guzzi Legacy:
Moto Guzzi is one of Italy's oldest motorcycle manufacturers, renowned for its innovative transverse V-twin engine configuration and durable, characterful motorcycles.
Le Mans Lineage:
The 850 Le Mans II is a development of the original 850 Le Mans (or Mk1), featuring styling updates, potential chassis refinements, and improved ergonomics. The 'II' designation indicates this second major iteration.
Manufacturing Location:
Mandello del Lario, Italy
