Market Segment:
        
        
            Dual-sport / Adventure motorcycle
        
     
    
    
        
            Competitors:
        
        
            Honda Africa Twin (XRV650/750), Yamaha Tenere, Kawasaki KLR650, Suzuki DR650.
        
     
    
    
        
            Design Philosophy:
        
        
            Robust, air-cooled boxer twin engine known for reliability and torque; shaft drive; capable off-road and comfortable for touring.
        
     
 
    
    
    
        
            Engine Overhaul:
        
        
            Complete disassembly, inspection, repair, and reassembly of the boxer twin engine.
        
     
    
        
            Transmission Service:
        
        
            Gearbox disassembly, inspection, repair, and reassembly; clutch service and replacement.
        
     
    
        
            Fuel System:
        
        
            Carburetor (Dell'Orto or Bing) overhaul, adjustment, and troubleshooting; fuel tank and pump maintenance.
        
     
    
        
            Ignition System:
        
        
            Ignition timing, coil testing, spark plug specifications, and electronic ignition system troubleshooting.
        
     
    
        
            Electrical System:
        
        
            Wiring diagrams, battery maintenance, charging system (alternator, regulator), lighting, and starter motor.
        
     
    
        
            Suspension And Steering:
        
        
            Front fork (telelever or conventional) overhaul, rear shock absorber replacement, steering head bearing service.
        
     
    
        
            Braking System:
        
        
            Brake fluid replacement, caliper overhaul, pad replacement, disc inspection, and hydraulic system bleeding.
        
     
    
        
            Wheel And Tire Service:
        
        
            Wheel bearing replacement, spoke tensioning (if applicable), tire mounting and balancing.
        
     
    
        
            Exhaust System:
        
        
            Exhaust system inspection, gasket replacement, and muffler service.
        
     
    
        
            Frame And Bodywork:
        
        
            Frame inspection, fairing and body panel removal/installation, seat service.
        
     
    
    
        
            Routine Maintenance:
        
        
            Oil changes, filter replacements, chain adjustment, brake checks, spark plug checks.
        
     
    
        
            Troubleshooting Guides:
        
        
            Diagnostic procedures for common problems across all major systems.
        
     
    
        
            Component Rebuilds:
        
        
            Detailed instructions for rebuilding engines, transmissions, carburetors, and brake calipers.
        
     
    
        
            Electrical Diagnostics:
        
        
            Step-by-step troubleshooting using wiring diagrams and component testing methods.
        
     
    
        
            Suspension Setup:
        
        
            Adjustments and overhaul procedures for front and rear suspension components.
        
     
    
    
        
            Technical Depth:
        
        
            Comprehensive, ranging from basic owner-level maintenance to in-depth professional workshop repairs and diagnostics.
        
     
 
    
    
    
        
            Engine Type:
        
        
            Air-cooled, four-stroke, boxer twin
        
     
    
        
            Engine Displacement R80:
        
        
            797.5 cc
        
     
    
        
            Engine Displacement R100:
        
        
            980 cc
        
     
    
        
            Bore X Stroke R80:
        
        
            82.5 mm x 75 mm
        
     
    
        
            Bore X Stroke R100:
        
        
            94 mm x 70.7 mm
        
     
    
        
            Compression Ratio R80:
        
        
            8.2:1
        
     
    
        
            Compression Ratio R100:
        
        
            8.5:1
        
     
    
        
            Horsepower R80 Approx:
        
        
            50 hp @ 6500 rpm
        
     
    
        
            Horsepower R100 Approx:
        
        
            60 hp @ 6250 rpm
        
     
    
        
            Torque R80 Approx:
        
        
            56 Nm (41 lb-ft) @ 5000 rpm
        
     
    
        
            Torque R100 Approx:
        
        
            70 Nm (52 lb-ft) @ 5000 rpm
        
     
    
    
        
            Carburetors R80:
        
        
            2 x Dell'Orto PHM 40 or Bing 40
        
     
    
        
            Carburetors R100:
        
        
            2 x Bing 40
        
     
    
        
            Fuel Tank Capacity:
        
        
            20 Liters (5.3 US gal)
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline, minimum 91 RON
        
     
 
    
    
    
        
            Safety Certification:
        
        
            ECE standards for motorcycles of the era
        
     
    
    
        
            Braking System Front:
        
        
            Dual 285 mm discs with dual-piston calipers (e.g., Brembo or Grimeca)
        
     
    
        
            Braking System Rear:
        
        
            200 mm drum brake (early models) or single 285 mm disc with single-piston caliper (later models)
        
     
    
    
        
            Lighting:
        
        
            Halogen headlamp, integrated turn signals, taillight/brake light.
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Every 5,000-10,000 km (3,000-6,000 miles) or annually, whichever comes first.
        
     
    
        
            Valve Adjustment Interval:
        
        
            Every 10,000 km (6,000 miles)
        
     
    
        
            Final Drive Oil Change:
        
        
            Every 10,000 km (6,000 miles)
        
     
    
    
        
            Engine Oil Type:
        
        
            SAE 20W-50 or SAE 15W-50 API SG or higher (e.g., BMW Motorrad ADVANTEC)
        
     
    
        
            Engine Oil Capacity Approx:
        
        
            2.5 Liters (with filter change)
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 4 (glycol-based)
        
     
    
    
        
            Common Issues:
        
        
            Worn output shaft seal, paralever pivot bearings, clutch slave cylinder leaks, starter motor brushes, fork seal leaks.
        
     
    
        
            Carburetor Issues:
        
        
            Float bowl leaks, synchronization drift, jet wear.
        
     
    
        
            Electrical Issues:
        
        
            Corrosion in connectors, failing voltage regulator, worn starter solenoid.
        
     
 
    
    
    
        
            Brand Origin:
        
        
            Bayerische Motoren Werke AG (BMW), Germany, founded 1916.
        
     
    
    
        
            Gs Series Heritage:
        
        
            The R80GS and R100GS are part of BMW's legendary 'Gelände/Straße' (Off-road/Street) series, pioneering the adventure touring segment.
        
     
    
        
            R80Gs Introduction:
        
        
            Introduced in 1980, revolutionizing motorcycle travel with its robust design and dual-purpose capability.
        
     
    
        
            R100Gs Introduction:
        
        
            Introduced in 1987, building on the R80GS with a larger engine and updated features.
        
     
    
    
        
            Production Period:
        
        
            R80GS: 1980-1987; R100GS: 1987-1996.
        
     
    
        
            Manufacturing Location:
        
        
            Berlin, Germany (BMW Motorrad plant)