This manual covers the R80 GS / R100 GS models from 1985, renowned dual-sport motorcycles that defined an era of adventure touring and off-road capability. These air-cooled boxer twin machines, featuring robust steel tube frames and shaft drive, are celebrated for their exceptional durability and long-distance touring prowess. The R100 GS models are distinguished by their innovative Monolever rear suspension, offering a unique blend of on-road comfort and off-road performance that set them apart in their segment. This comprehensive Service Repair Workshop Manual in English provides detailed information for the maintenance and repair of your R80 GS / R100 GS. It covers all essential systems, including the engine, transmission, chassis, electrical system, suspension, brakes, fuel system, and exhaust. The manual includes routine maintenance procedures, component overhauls, troubleshooting guides, torque specifications, wiring diagrams, and identifies special tools. Its extensive coverage ensures that owners and technicians have the necessary resources to keep these iconic motorcycles in optimal condition. 🏷️ Basic Information Identification Make: BMW Model: R80 GS / R100 GS Year: 1985 Codes Chassis Code: 247 Engine Code Prefix: 247 👋 Introduction Market Position Category: Dual-sport motorcycle Segment: Adventure touring, off-road capable touring Competitive Analysis Competitors 1985: Honda Transalp (later), Yamaha Tenere, Suzuki DR series, Kawasaki KLR Key Features Engine Type: Air-cooled boxer twin Drive System: Shaft drive Suspension R100Gs: Monolever rear suspension (single-sided swingarm) Suspension R80Gs: Traditional twin rear shock absorbers Durability: Renowned for robustness and long-distance touring capability Off Road Capability: Designed with significant off-road prowess for its era 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Chassis: Yes Electrical System: Yes Suspension: Yes Brakes: Yes Bodywork: Yes Fuel System: Yes Exhaust System: Yes Wheels And Tires: Yes Troubleshooting: Yes Page Count Estimated Pages: 300+ Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Full overhaul, cylinder head, pistons, crankshaft, timing, valve train Engine Management: Ignition system, fuel injection (K-Jetronic for R100, Bing carburetors for R80), starting system, charging system Transmission Gearbox: Disassembly, assembly, gear inspection, shifting mechanism Drivetrain: Clutch (single plate dry), driveshaft, universal joints, rear axle, final drive Frame And Suspension: Frame inspection and repair, front fork (telescopic), rear swingarm, shock absorbers (Monolever for R100GS, twin shocks for R80GS) Braking System: Front and rear brake systems (disc brakes), hydraulic lines, master cylinders, calipers, bleeding procedures Electrical System: Wiring diagrams, lighting system, instrumentation, battery, starter motor, alternator, ignition coils, fuses Fuel And Exhaust: Fuel tank, fuel pump, fuel lines, carburetor overhaul (R80GS), K-Jetronic fuel injection troubleshooting (R100GS), exhaust system components Procedures Included Routine Maintenance: Oil changes, filter replacement, spark plug checks, chain adjustment (if applicable, though these are shaft-driven), valve clearance adjustments, lubrication points Component Overhaul: Complete engine rebuild, gearbox rebuild, carburetor servicing, fuel injection system servicing, brake caliper overhaul, suspension component rebuild Troubleshooting Diagnostics: Step-by-step diagnostic procedures for common starting, running, and electrical issues, fault finding charts Torque Specifications: Detailed torque values for all critical fasteners and components Wiring Diagrams: Comprehensive electrical schematics for all systems Special Tools: Identification and usage of BMW-specific tools required for certain procedures Technical Depth Depth: Comprehensive: Covers everything from basic maintenance to full engine and transmission rebuilds, including advanced diagnostics and electrical system repair. 📊 Manual Specifications File Format Format: PDF Searchability: Likely text-searchable, enabling quick access to specific information Print Quality: Dependent on original source, typically clear and legible for printing Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Type: Four-stroke, air-cooled boxer twin Bore X Stroke R80: 80.0 mm x 78.0 mm Bore X Stroke R100: 94.0 mm x 70.5 mm Displacement R80: 797.5 cc Displacement R100: 980 cc Compression Ratio R80: 8.2:1 Compression Ratio R100: 8.5:1 Horsepower R80: 50 hp @ 6500 rpm (approx.) Horsepower R100: 65 hp @ 7250 rpm (approx.) Torque R80: 57 Nm @ 5000 rpm (approx.) Torque R100: 78 Nm @ 6000 rpm (approx.) Fuel System R80Gs Carburetor: 2 x Bing 32mm constant-vacuum carburetors R100Gs Fuel Injection: Bosch L-Jetronic (K-Jetronic) fuel injection system Fuel Type: Unleaded gasoline (91 octane or higher) Lubrication System: Wet sump Ignition System: Breakerless electronic ignition 🔧 Transmission Standard Type: 5-speed constant mesh gearbox Features Drive: Shaft drive to rear wheel Clutch: Single plate, dry type, hydraulically operated 📐 Dimensions Exterior Length Approx: 2200 mm Width Approx: 900 mm Height Approx: 1400 mm Weights Dry Weight R80: 200 kg (approx.) Dry Weight R100: 207 kg (approx.) Wet Weight R80: 215 kg (approx.) Wet Weight R100: 222 kg (approx.) Gross Vehicle Weight Rating: 370 kg (approx.) Fuel Tank Capacity: 20 Liters (incl. 3L reserve) 🛡️ Safety Features Ratings Safety Rating: N/A (Motorcycle safety standards of the era) Active Features Brakes: Dual 285mm front discs, single 200mm rear disc (R100GS has dual front discs as standard, R80GS often single...