Context:
The Moto Guzzi 850 El Dorado was a significant model for Moto Guzzi, intended as a larger displacement touring motorcycle to compete in the burgeoning large-bike market of the mid-1970s. It represented a step up in comfort and power from their earlier V7 models.
Distinctive Elements:
Characterized by its transverse V-twin engine, shaft drive, and comfortable riding posture, it offered a unique European alternative to American and British large-displacement motorcycles. The El Dorado variant often featured more touring-oriented amenities.
Utility:
This Riders Handbook serves as a primary guide for owners of the Moto Guzzi 850 El Dorado, providing essential information for safe operation, basic maintenance, and understanding the motorcycle's features.
Engine Systems:
Engine operation, lubrication, cooling, ignition system overview.
Fuel System:
Carburetor operation and adjustment (likely Dell'Orto VHB-30), fuel delivery.
Drivetrain:
Clutch operation, gearbox, final drive (cardan shaft drive).
Electrical System:
Lighting, battery, charging system (alternator/generator), starter motor, basic wiring.
Chassis And Suspension:
Frame, front fork (likely Marzocchi), rear shock absorbers, wheel and tire maintenance.
Braking System:
Front and rear brake operation and maintenance (likely drum brakes).
Routine Maintenance:
Oil level checks, tire pressure, chain adjustment (if applicable, though El Dorado had shaft drive), spark plug inspection, air filter cleaning.
Basic Adjustments:
Carburetor idle adjustment, clutch lever adjustment, brake lever adjustment.
Troubleshooting:
Basic guidance for common running issues.
Scope:
Focuses on rider-centric information, daily checks, and basic operational guidance rather than in-depth mechanical repair or complete overhaul.
Print Quality:
Standard for its era, likely black and white illustrations and text.
Binding Type:
Likely saddle-stitched or stapled, common for thinner rider handbooks.
Paper Type:
Standard paper, suitable for everyday reference.
Type:
Four-stroke, air-cooled, 90-degree (V-twin) OHV
Displacement:
844 cc (51.5 cu in)
Bore X Stroke:
88 mm x 68 mm
Compression Ratio:
9.0:1 (approx.)
Horsepower:
Approx. 65 hp @ 6,000 rpm
Torque:
Approx. 73 Nm (54 lb-ft) @ 4,500 rpm
Carburetors:
2 x Dell'Orto VHB-30 (or equivalent) twin-choke downdraft carburetors
Fuel Type:
Unleaded gasoline (RON 90-95 recommended)
System:
Contact breaker points and coil ignition
System:
Wet sump with oil cooler
Crash Test Data:
Not applicable for motorcycles of this era.
Braking:
Dual leading shoe front drum brake, single leading shoe rear drum brake. Adequate for its performance envelope but requires deliberate application.
Lighting:
Halogen headlight, tail light, brake light, turn signals.
Frame Integrity:
Steel double-cradle frame, providing robust support.
Oil Change:
Every 3,000-5,000 km (1,800-3,100 miles) or annually, whichever comes first.
Valve Clearance Check:
Every 5,000-7,500 km (3,100-4,600 miles)
Spark Plug Replacement:
Every 10,000-15,000 km (6,200-9,300 miles)
Brake Adjustment:
As needed, typically every 5,000 km (3,100 miles)
Engine Oil:
SAE 20W-50 motorcycle-specific oil (API SG or higher). Capacity: Approx. 3.5 liters (3.7 US quarts) with filter change.
Final Drive Oil:
SAE 80W-90 hypoid gear oil. Capacity: Approx. 0.2 liters (6.8 US oz).
Brake Fluid:
DOT 3 or DOT 4 brake fluid (if hydraulic brakes were fitted, which is less common on base El Dorado models; check caliper type).
Electrical Gremlins:
Aging wiring, connectors, and ignition components can lead to intermittent electrical problems. Regular cleaning and checking of grounds is advised.
Carburetor Tuning:
Dell'Orto VHB carburetors can be sensitive and require periodic cleaning and synchronization for optimal performance.
Pushrod Seals:
Potential for minor oil leaks from pushrod tube seals.
Maintenance Schedule Summary
Owner Tasks:
Regular checks of oil level, tire pressure, lights, and brakes are critical. Cleaning of the motorcycle and chain (if applicable) ensures longevity.
Moto Guzzi Legacy:
Moto Guzzi, founded in 1921, is renowned for its innovative V-twin engines, particularly the transverse configuration, which has become its signature. The brand has a strong history in racing and touring motorcycles.
El Dorado Development:
The 850 El Dorado evolved from earlier 750cc and 850cc models like the V7 Sport and 850 T, focusing on increased displacement, comfort, and touring capabilities, incorporating shaft drive for reduced maintenance.
Production Period:
Approximately 1974-1975
Manufacturing Location:
Mandello del Lario, Italy
Historical Impact:
While specific awards are rare for this era's motorcycles, the 850 El Dorado is recognized by enthusiasts as a classic Italian V-twin, appreciated for its character and touring capability.
Enthusiast Appreciation:
Highly regarded by vintage Moto Guzzi collectors and riders for its unique V-twin rumble, shaft drive convenience, and solid build.
