Category:
Dual-sport Motorcycle
Target Audience:
Owners and independent mechanics of BMW R80 GS and R100 GS motorcycles
Historical Context:
The GS series defined the premium adventure motorcycle segment, known for ruggedness and off-road capability
Vehicle Design:
Air-cooled boxer twin-cylinder engine, shaft drive, robust suspension, capable off-road and on-road performance
Manual Value:
Essential for maintaining and repairing these iconic, air-cooled BMW motorcycles.
Engine:
Full disassembly, assembly, tuning, troubleshooting, diagnostics (including BMW Boxer twin-cylinder air-cooled engines)
Transmission:
Gearbox disassembly, assembly, maintenance, troubleshooting, lubrication
Drivetrain:
Shaft drive system, clutch operation, final drive maintenance
Brakes:
Hydraulic system, brake caliper service, fluid replacement, troubleshooting (likely Brembo systems for this era)
Suspension:
Front fork (Monolever/Paralever system for R100GS), rear shock absorber, swingarm, wheel bearings
Electrical System:
Ignition system, charging system (alternator, regulator), starter motor, lighting, wiring diagrams
Fuel System:
Carburetor service (likely Bing), fuel tank, fuel lines, fuel pump (if applicable)
Exhaust System:
Exhaust pipe and muffler maintenance, gasket replacement
Bodywork And Frame:
Frame inspection, body panel removal and installation, fairing (if equipped), seat maintenance
Maintenance:
Scheduled maintenance, oil changes, filter replacements, valve adjustments, spark plug replacement, brake bleeding
Repair:
Engine rebuilds, transmission overhauls, suspension component replacement, electrical diagnostics and repair, clutch replacement
Troubleshooting:
Diagnostic procedures for common problems, fault finding charts
Assembly Disassembly:
Step-by-step instructions for complete component removal and installation
Special Tools:
Identification and usage of BMW specific tools required for certain procedures
Depth:
Comprehensive (covers basic maintenance to full engine and transmission rebuilds)
Diagnostics:
Detailed diagnostic procedures and troubleshooting guides
Specifications:
Torque values, clearances, fluid types, electrical parameters
Engine Type:
Air-cooled, four-stroke, boxer twin-cylinder
Displacement R80:
797.5 cc
Displacement R100:
980 cc
Horsepower R80:
Approx. 50 hp @ 6500 rpm
Horsepower R100:
Approx. 60 hp @ 7000 rpm
Torque R80:
Approx. 57 Nm (42 lb-ft) @ 5000 rpm
Torque R100:
Approx. 70 Nm (52 lb-ft) @ 5500 rpm
Carburetor Type:
Dual Bing 32mm CV or 40mm (depending on specific model variant)
Fuel Type:
Unleaded gasoline (minimum 91 RON/87 AKI recommended)
Bore Stroke R80:
83 mm x 75 mm
Bore Stroke R100:
94 mm x 70.8 mm
Compression Ratio:
Approx. 8.5:1 to 9.5:1 (varies by model)
Length:
Varies by model, typically around 2200-2300 mm
Width:
Varies by model, typically around 800-900 mm (handlebar width)
Height:
Varies by model, typically around 1300-1400 mm (seat height)
Dry Weight R80:
Approx. 195-205 kg
Dry Weight R100:
Approx. 205-215 kg
Fuel Tank Capacity:
21 Liters (including 3-4 Liter reserve)
Safety Certification:
N/A (Motorcycle safety ratings not standardized as cars)
Braking System:
Dual front disc brakes (often Brembo), single rear disc brake
Suspension Stability:
Monolever (R80GS) and Paralever (R100GS) rear suspension systems for improved stability
Lighting:
Halogen headlamp, LED tail light (original incandescent)
Infotainment System:
N/A (This era of motorcycles did not feature electronic infotainment systems)
ABS:
N/A (ABS was not commonly available or standard on these models)
Connectivity Features:
N/A (No integrated electronic connectivity)
Ignition System:
Electronic ignition (CDI or similar)
Oil Change Interval:
Every 5,000 - 10,000 km or annually (refer to manual for precise intervals)
Valve Adjustment Interval:
Every 10,000 - 15,000 km
Spark Plug Replacement:
Every 10,000 - 15,000 km
Engine Oil Type:
API SG or higher, SAE 20W-50 or 10W-40 motorcycle specific oil
Engine Oil Capacity:
Approx. 2.75 Liters (with filter change)
Common Problems:
Oil leaks (especially around engine cases and pushrod seals), clutch wear, aging electrical connectors, suspension wear, carburetor synchronization issues.
Repair Focus:
The manual will guide on addressing these typical wear-and-tear items and potential failure points.
Bmw Motorrad:
BMW Motorrad has a long history of producing reliable and capable motorcycles, particularly known for their boxer engines.
Gs Lineage:
The R80G/S (1980) pioneered the dual-sport segment. The R80GS and R100GS further evolved this concept with improved suspension (Paralever on R100GS) and power.
Production Period:
The R80GS and R100GS models were produced from late 1980s through the mid-1990s.
Manufacturing Location:
Berlin, Germany (Spandau plant)
