This manual covers the R80 GS and R100 GS models from 1986. These dual-sport motorcycles were pioneering in the adventure touring segment, offering robust performance and significant off-road capability. Known for their air-cooled boxer twin-cylinder engines, the R80 GS (797.5 cc) and R100 GS (980 cc) featured a revolutionary Paralever single-sided swingarm with shaft drive for improved rear suspension performance and reduced torque reaction. With long-travel suspension, dual Bing carburetors, and a durable steel tube frame, these machines were built for both terrain and street, establishing the GS lineage. This comprehensive Service Repair Workshop Manual provides full service and repair instructions for the R80 GS and R100 GS models. It details maintenance procedures, troubleshooting guides, technical specifications, and safety guidelines. The manual covers engine disassembly and assembly, transmission and drivetrain maintenance, suspension and brake system repairs, electrical system diagnostics, fuel system service, and frame and bodywork. With step-by-step instructions for component repair and overhaul, this manual is an essential resource for owners and technicians to maintain and repair these iconic motorcycles effectively. 🏷️ Basic Information Identification Make: BMW Model: R80 GS / R100 GS Model Year: 1986 Codes Chassis Codes: 247 (R80 GS), 248 (R100 GS) Engine Codes: 117EG (R80 GS), 102EF (R100 GS) 👋 Introduction Market Position Segment: Dual-sport motorcycle Positioning: The R80GS and R100GS were pioneering models in the adventure touring segment, offering robust performance and off-road capability. Competitive Analysis Competitors 1986: Honda Transalp, Yamaha Tenere, Suzuki DR650/750S. Key Features Engine Type: Air-cooled boxer twin-cylinder Drivetrain Gs Specific: Paralever single-sided swingarm with shaft drive (introduced on GS models for reduced torque reaction). Suspension Gs Specific: Long-travel suspension for off-road capability. Fuel Delivery: Dual Bing carburetors. 📋 Manual Details Coverage Areas Topic Coverage: Full service and repair instructions Page Count Estimated Pages: 300+ Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Detailed diagrams, disassembly, assembly, tuning, troubleshooting for both R80 and R100 boxer engines. Transmission: Gearbox maintenance, repair, overhaul, troubleshooting, lubrication. Drivetrain: Final drive (Paralever system), driveshaft, universal joints, clutch maintenance and repair. Suspension: Front forks (including telescopic fork maintenance, seal replacement), rear shock absorber (monoshock for GS models), Paralever rear suspension system adjustments and rebuild. Brakes: Front and rear brake systems (disc brakes), caliper maintenance, master cylinder rebuild, fluid replacement, bleeding procedures. Electrical System: Ignition system, charging system (alternator, voltage regulator), lighting, starter motor, battery, wiring diagrams, troubleshooting electrical faults. Fuel System: Carburetor service and tuning (Bing carburetors), fuel tank maintenance, fuel lines, fuel pump (if applicable). Cooling System: Oil cooling system maintenance (oil cooler, lines). Exhaust System: Exhaust manifold, muffler inspection and replacement. Frame And Bodywork: Frame inspection, fairing, seat, fuel tank removal and installation, fenders, luggage rack mounting. Procedures Included Maintenance: Routine servicing, oil changes, filter replacements, spark plug checks, valve adjustments, brake fluid changes, chain adjustment (if applicable). Troubleshooting: Systematic diagnostic procedures for common and uncommon issues, fault finding charts. Repair: Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation. Overhaul: Complete engine rebuild, gearbox overhaul, suspension component refurbishment. Adjustments: Carburetor synchronization, idle speed adjustment, ignition timing, suspension sag. Specifications Torque: Torque specifications for all critical fasteners. Technical Depth Depth: Comprehensive, covering everything from basic checks to full engine and transmission rebuilds, suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format File Type: PDF Searchable Text: Likely searchable text within PDF for efficient information retrieval. Print Quality Quality: Digital reproduction of original factory documentation, ensuring clarity of text and diagrams. Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Type: Air-cooled, four-stroke, boxer twin-cylinder Bore X Stroke R80: 80.0 mm x 78.0 mm Bore X Stroke R100: 94.0 mm x 70.7 mm Displacement R80: 797.5 cc Displacement R100: 980 cc Compression Ratio R80: 8.2:1 Compression Ratio R100: 8.5:1 Performance Horsepower R80: 50 HP @ 6500 rpm Horsepower R100: 65 HP @ 7250 rpm Torque R80: 57 Nm @ 4000 rpm Torque R100: 70 Nm @ 6000 rpm Fuel System Carburetor Type: 2 x Bing 32mm CV (Constant Velocity) carburetors Fuel Type: Unleaded gasoline (premium) Valve Train Valve Actuation: Overhead valves (OHV), pushrod actuated Valve Clearance Spec Intake: 0.10 mm - 0.20 mm (cold) Valve Clearance Spec Exhaust: 0.20 mm - 0.30 mm (cold) 🔧 Transmission Standard Type: 5-speed manual gearbox Final Drive: Shaft drive via Paralever system Features Clutch Type: Dry, single plate, diaphragm spring clutch Gearbox Oil Spec: SAE 75W/90 API GL-5 gear oil Final Drive Oil Spec: SAE 75W/90 API GL-5 gear oil 📐 Dimensions Exterior Length Approx: 2200 mm Width Approx: 800 mm Height Approx: 1350 mm Weights Dry Weight R80: 197 kg Dry Weight R100: 207 kg Gross Vehicle Weight Rating Approx: 385 kg Cargo Fuel Tank Capacity: 26 Liters (including 4-liter reserve) 🛡️ Safety Features...