Segment:
BMW's boxer-twin motorcycles are positioned as premium touring, adventure touring, and classic/heritage road bikes, known for their robust engineering and distinctive character.
Target Audience:
Owners seeking to perform their own maintenance and repairs, restoring enthusiasts, and professional motorcycle technicians.
Competitors:
During this period, BMW boxer twins competed with other large-displacement motorcycles from brands like Moto Guzzi, Harley-Davidson, and Japanese manufacturers offering larger touring or sport-touring models.
Engine Architecture:
Air-cooled, four-stroke boxer twin-cylinder engine with horizontally opposed cylinders.
Drivetrain:
Shaft drive, a signature feature of BMW motorcycles, providing low maintenance and a clean aesthetic.
Design Philosophy:
Emphasis on reliability, durability, long-distance comfort, and rider engagement, often with a utilitarian yet sophisticated aesthetic.
Primary Focus:
Factory service and repair for BMW R 80 and R 100 motorcycles.
Additional Coverage Mentioned:
Includes BMW R 80 R 100 1998 Service Repair Manual Download, indicating comprehensive year-to-year coverage for that era.
Estimated Pages:
Manufacturer service manuals for this era typically range from 300-700+ pages depending on the specific models and variants covered within the manual. Exact count not provided.
Type:
Service Repair Manual
Language:
Likely English, as per industry standard for downloadable service manuals targeting international markets. Specific language not explicitly stated.
Engine:
Detailed overhaul procedures for the BMW boxer twin engine, including cylinder head, valve train, piston, crankshaft, timing, lubrication system, and cooling (air-cooled).
Fuel System:
Carburetor adjustment, cleaning, and rebuilding (e.g., Bing carburetors), fuel pump operation, fuel tank maintenance, and fuel lines.
Ignition System:
Ignition timing, spark plug specifications, coil and ignition module testing, and troubleshooting.
Transmission:
Gearbox disassembly, assembly, inspection, clutch operation, and final drive maintenance.
Brakes:
Brake system diagnostics, caliper overhaul, master cylinder service, brake fluid replacement, disc and pad inspection.
Electrical System:
Wiring diagrams, battery maintenance, charging system (alternator/generator), starter motor, lighting, horn, and instrument cluster.
Suspension Steering:
Front fork service (including oil changes and seal replacement), rear shock absorber maintenance, steering head bearing adjustment, and wheel bearing service.
Frame Bodywork:
Frame inspection, body panel removal and installation, seat, fuel tank, and fairing (if applicable) service.
Wheels Tires:
Tire pressure, inspection, and replacement, wheel balancing, spoke tensioning (if applicable), and rim maintenance.
Maintenance:
Routine service tasks such as oil changes, filter replacements, spark plug checks, chain adjustment, and lubrication schedules.
Troubleshooting:
Diagnostic procedures for common running issues, electrical faults, and mechanical problems, often with symptom-based guides.
Repair Rebuild:
Detailed step-by-step instructions for major component overhauls and repairs, including engine, transmission, and suspension.
Diagnostics:
Procedures for checking and adjusting engine parameters like valve clearances, ignition timing, and carburetor synchronization.
Specifications Data:
Torque specifications, fluid capacities, wear limits, and adjustment data critical for proper repair and maintenance.
Depth:
Comprehensive, covering everything from basic rider maintenance to full engine and transmission rebuilds. Geared towards experienced mechanics and dedicated enthusiasts.
Diagnostic Capability:
Advanced diagnostic procedures for electrical and mechanical systems, including component testing and circuit analysis.
Rebuild Procedures:
Detailed, illustrated instructions for complete component disassembly, cleaning, inspection, part replacement, and reassembly.
Configuration:
Air-cooled, four-stroke, boxer twin-cylinder
Displacement:
R 80 typically around 798cc; R 100 typically around 980cc. Exact figures may vary slightly by specific sub-model.
Bore X Stroke:
R80: 80.7 mm x 78.0 mm (approx.); R100: 94.0 mm x 70.7 mm (approx.). Specifics depend on model variant.
Compression Ratio:
Typically in the range of 8.5:1 to 9.5:1, varying by specific engine variant (e.g., R100GS vs R100RT).
Horsepower:
R80: ~50 hp @ 6500 rpm; R100: ~60-70 hp @ 7000 rpm. Figures vary by specific model and tuning.
Torque:
R80: ~56 Nm @ 5000 rpm; R100: ~70-75 Nm @ 5500 rpm. Figures vary by specific model and tuning.
Carburetors:
Typically dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model).
Fuel Type:
Unleaded gasoline, typically 91 RON (87 AKI) or higher.
Wheelbase:
Varies by model, typically around 1400-1450 mm (55-57 inches).
Seat Height:
Varies by model, approximately 760-820 mm (30-32 inches).
Capacity:
Standard configuration for touring models might include pannier mounts. Capacity is generally rider-centric.
Dry Weight:
Varies by model, typically 200-230 kg (440-500 lbs).
Gross Vehicle Weight Rating:
Not explicitly defined in a car-manual style, but relates to rider, passenger, and luggage payload.
Crash Test Results:
N/A (Motorcycle safety ratings differ from automotive; focus is on operational safety and design features.)
Braking System:
Disc brakes front and rear, often with ABS availability on later R100 models (e.g., R100RT).
Lighting:
Halogen headlight, taillight, and turn signals for visibility.
Frame Construction:
Steel tube frame, designed for stability and durability.
Wind Protection:
Varies by model; RT models feature extensive fairings and windshields for rider comfort and protection.
Oil Change:
Typically every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually, depending on usage and manual recommendations.
Valve Clearance Check:
Usually every 10,000 - 20,000 km (6,000 - 12,000 miles).
Major Service:
Includes comprehensive checks, fluid changes, and adjustments, often around 20,000 - 40,000 km (12,000 - 24,000 miles).
Engine Oil:
Typically SAE 20W-50 or 10W-40 motorcycle-specific oil (API SG or higher). Refer to manual for precise recommendation.
Gearbox Oil:
Hypoid gear oil, API GL-5, SAE 80W-90 is common. Manual will specify exact type and quantity.
Brake Fluid:
DOT 4 or DOT 5.1, depending on model year and ABS presence. Consult manual.
Fork Oil:
Specific viscosity oil, typically SAE 15W or 20W. Manual provides exact type and amount.
Common Wear Items:
Clutch wear, output shaft seal leaks, final drive spline lubrication, and front fork seal leaks are common maintenance points.
Electrical Connections:
Corrosion in connectors, particularly in older models, can lead to intermittent electrical issues.
Carburetor Issues:
Float bowl leaks or sticky slides on Bing carburetors can affect fuel delivery and idle stability.
Legacy:
BMW Motorrad has a long and storied history, dating back to the 1920s, with the boxer twin engine being its most iconic and enduring design.
R Series Development:
The R 80 and R 100 models are descendants of the foundational R32 and represent a continuous evolution of the boxer twin platform, focusing on increased displacement, improved performance, and enhanced touring capabilities.
Manufacturing Location:
Germany (primarily Berlin-Spandau)
Production Period For This Manual:
1999-2008 indicates that this manual covers models produced during this period, and likely some earlier variants that carried over or were very similar.
