Primary Models Covered:
BMW R80, R90, R100
Model Years Covered:
1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
Estimated Page Count:
Extensive (typical for a factory service manual covering multiple models and years)
Type:
Factory Repair Service Manual
Format:
Digital Download (PDF)
Engine:
Detailed overhaul, troubleshooting, timing, carburetion, lubrication, cooling systems
Transmission:
Gearbox disassembly, assembly, maintenance, troubleshooting
Drivetrain:
Shaft drive, final drive maintenance and repair
Electrical System:
Ignition system, lighting, charging system, starter, wiring diagrams
Braking System:
Brake caliper overhaul, master cylinder, brake fluid specifications, adjustment
Suspension Steering:
Front forks, rear shock absorbers, steering head bearing maintenance and repair
Fuel System:
Fuel tank, fuel lines, fuel pump (if applicable), carburetor tuning and rebuild
Frame Bodywork:
Frame inspection, body panel removal/installation, seat, fairings (if applicable)
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug checks, valve adjustments
Troubleshooting:
Diagnostic flowcharts, common problems and solutions
Repair:
Detailed step-by-step instructions for component repair and replacement
Rebuilds:
Engine, gearbox, and carburetor rebuild procedures
Adjustments:
Carburetor synchronization, clutch adjustment, brake bleeding
Wiring Diagrams:
Complete electrical system schematics
Depth:
Comprehensive factory-level technical information for professional technicians and experienced enthusiasts
Configuration:
Air-cooled, horizontally opposed twin-cylinder (Boxer)
Displacement Range:
Approx. 797cc (R80), 898cc (R90), 980cc/1000cc (R100)
Valvetrain:
Overhead valves (OHV), pushrod actuated
Horsepower Range:
Varies by model and year, typically 50-70 hp
Torque Range:
Varies by model and year, typically 40-55 lb-ft
Carburetion:
Dual Bing carburetors (e.g., Bing 32, 40, 42 depending on model)
Fuel Type:
Unleaded gasoline (check manual for octane recommendations)
Oil Change:
Typically every 3,000-5,000 miles or annually
Valve Adjustment:
Every 6,000-10,000 miles (critical for performance and longevity)
Spark Plugs:
Check/replace every 6,000-12,000 miles
Engine Oil:
SAE 20W-50 or 10W-40 (check manual for specific viscosity and API rating recommendations)
Gearbox Oil:
GL-5 Hypoid Gear Oil (e.g., SAE 80W/90)
Final Drive Oil:
GL-5 Hypoid Gear Oil (e.g., SAE 80W/90)
Brake Fluid:
DOT 3 or DOT 4 (check manual for specific type)
Common Problems:
Carburetor synchronization drift, output shaft seal leaks, starter motor brushes, occasional electrical connector corrosion
Preventative Measures:
Regular valve adjustments, proper lubrication, keeping electrical connections clean and protected