Target Audience:
BMW motorcycle enthusiasts, owners seeking to perform their own maintenance and repairs, independent motorcycle repair shops.
Historical Significance:
The R 80 GS is a landmark motorcycle that defined the adventure bike category, while the R 100 R offered a more powerful and refined interpretation of BMW's boxer-twin roadster.
Value Proposition:
Provides factory-level technical information, empowering owners to maintain and repair their motorcycles efficiently, saving on dealership labor costs, and ensuring proper long-term care.
Manual Advantages:
Instant download for immediate access, comprehensive coverage of all service and repair aspects, high-quality diagrams and illustrations, authoritative factory data, cost savings for owners.
Major Systems:
Engine, gearbox, clutch, drivetrain, suspension (front and rear), brake system (front and rear), electrical system (including ignition, charging, lighting, and accessories), fuel system, chassis, frame attachments, exhaust system, wheels, and tires.
Electrical Details:
Comprehensive wiring diagrams, troubleshooting of lighting, ignition system (points or electronic depending on year), charging system (alternator, voltage regulator), starter motor, battery, instrumentation, and accessory circuits.
Suspension Details:
Front telescopic forks (including oil type, level, seal replacement, spring issues) and rear swingarm with monolever or twin shock absorbers (depending on specific model variant). Adjustment procedures for pre-load and damping where applicable.
Chassis And Frame:
Frame inspection, steering head bearing service and adjustment, swingarm lubrication and bearing checks, side stand and center stand operation and repair.
Key Procedures:
Routine maintenance (oil changes, filter replacements, spark plug servicing, chain adjustment), pre-delivery inspections, component disassembly and reassembly, troubleshooting guides, diagnostic procedures, electrical system testing and repair, brake system servicing and bleeding, suspension adjustments and rebuilds, engine tuning, clutch adjustment and replacement, gearbox inspection and repair, exhaust system repair, torque specifications for all fasteners, and general servicing.
Engine Overhaul:
Detailed procedures for cylinder head removal and reassembly, piston and ring replacement, crankshaft and connecting rod inspection and repair, camshaft and valve train servicing, oil pump servicing, and engine case splitting and reassembly.
Troubleshooting Guide:
Systematic troubleshooting flowcharts and diagnostic tips for common running problems, electrical faults, and mechanical issues. For example, 'engine no start,' 'poor idle,' 'overheating'.
Wheel And Tire Service:
Wheel bearing inspection and replacement, spoke tensioning and wheel truing (if applicable to spoked wheels), tire mounting and balancing, tire pressure recommendations.
Level Of Detail:
Comprehensive, ranging from basic user maintenance to in-depth mechanical and electrical repair procedures. Includes detailed exploded views, diagrams, schematics, and step-by-step instructions equivalent to dealership technician level.
Torque Values:
Specific torque specifications for all critical fasteners, including engine components, chassis fasteners, wheel nuts, brake caliper bolts, and suspension mounting points.
Diagnostic Tools:
Information on using basic tools for diagnosis, such as multimeters for electrical testing, feeler gauges for valve clearances, and diagnostic indicators.
Engine Type:
Air-cooled, four-stroke, boxer-twin cylinder engine.
Engine Displacement:
R 80 GS: 797.5 cc; R 100 R: 979.5 cc
Horsepower Range:
R 80 GS: Approx. 50 HP; R 100 R: Approx. 60 HP (varies by specific model year and tuning)
Torque Figures:
R 80 GS: Approx. 70 Nm (52 lb-ft) at 5,000 rpm; R 100 R: Approx. 80 Nm (59 lb-ft) at 6,000 rpm (approximate values).
Fuel Delivery:
Dual carburetors (e.g., Bing 32/40/42/45 mm, depending on model year and variant).
Valve Train:
Overhead valves, pushrod actuated, with adjustable tappets.
Cooling Method:
Air cooling via finned cylinders and cylinder heads.
Dry Weight:
R 80 GS: Approx. 185 kg (408 lbs); R 100 R: Approx. 195 kg (430 lbs) (Dry weight varies by specific model and equipment).
Gross Vehicle Weight Rating:
Refer to specific model year documentation; typically in the range of 350-400 kg (770-880 lbs) for combined rider, passenger, and luggage.
Fuel Capacity:
Typically 19-21 liters (5.0-5.5 US gallons) depending on model year and tank size.
Wheel Sizes:
Typically 18 or 19-inch front wheel and 17-inch rear wheel. Specific sizes detailed in manual.
Dashboard Features:
Analog speedometer, tachometer, fuel gauge, odometer, trip meter, warning lights for oil pressure, charging, neutral, and turn signals. Basic but functional.
Advanced Features:
Not applicable. These models predate modern electronic rider aids and driver assistance systems.
Connectivity Options:
Not applicable. No onboard computers or connectivity features.
Oil Change Interval:
Typically every 5,000 - 10,000 km or annually, whichever comes first. Manual will specify exact intervals.
Engine Oil Type:
Specific viscosity grade and type (e.g., SAE 20W-50 or 10W-40, mineral or semi-synthetic) as per factory recommendations. Manual will detail precise specifications.
Gearbox Oil Type:
Specific gear oil viscosity grade (e.g., SAE 90 or 80W-90) as per factory manual. Often GL-5 specification.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid, depending on original specification. Manual will confirm.
Common Wear Items:
Transmission input shaft splines, clutch wear, fork seals, charging system components (rectifier/regulator), fuel petcock leaks, and exhaust system corrosion. The manual will detail how to inspect and address these.
Electrical Common Problems:
Corrosion on wiring connectors, faulty battery charging, weak ignition spark due to worn points or coil issues.
Major Service Items:
Valve clearance adjustment (every 10,000 - 20,000 km), ignition timing check/adjustment, carburetor synchronization, fuel filter replacement, air filter cleaning/replacement.
Brand Specialty:
BMW is renowned for its engineering precision, durability, and pioneering motorcycle designs, particularly its boxer-twin engine and shaft drive systems.
Design Philosophy:
Emphasis on robust engineering, rider comfort over long distances, and reliable shaft-drive systems for reduced maintenance.
Gs Lineage:
The R 80 GS pioneered the 'Gelände/Straße' (off-road/street) dual-purpose motorcycle segment, establishing the adventure touring motorcycle category. The R 100 R is a descendant, focusing more on road-biased performance with the larger engine.
Engine Updates:
Engine sizes evolved from 800cc to 1000cc across variants, with updates to ignition systems and minor chassis revisions over production runs.
Production Era:
The R 80 GS was produced from 1980 to 1987. The R 100 R was produced from 1991 to 1995.
