This manual covers the R80GS and R100GS models from 1987, iconic adventure motorcycles renowned for their robust engineering and versatility. These boxer-twin powered machines, featuring shaft drive and the innovative Monolever rear suspension, were designed for both on-road touring and off-road exploration. Their durable construction and capable performance have cemented their status as highly sought-after, reliable adventure bikes, a testament to a long heritage in motorcycle manufacturing. This comprehensive workshop and service manual provides in-depth guidance for the maintenance and repair of your R80GS or R100GS. It details procedures for all major systems, including the engine, transmission, chassis, brakes, and electrical components, alongside routine maintenance tasks and troubleshooting guides. With detailed diagrams and expert-level information, this manual is an essential resource for owners and technicians aiming to preserve the performance and longevity of these legendary motorcycles. 🏷️ Basic Information Identification Make: BMW Model: R80 GS / R100 GS Year: 1987 👋 Introduction Market Position Market Position: Essential resource for owners and mechanics of the iconic BMW R80GS and R100GS adventure motorcycles. Competitive Analysis Competitive Advantage: Provides in-depth, professional-level repair and maintenance information that surpasses basic owner's manuals, enabling owners to perform complex tasks. Key Features Key Feature 1: Covers both R80GS and R100GS variants, maximizing utility for owners of either model. Key Feature 2: Detailed diagrams and illustrations crucial for visual understanding of procedures. Key Feature 3: Authoritative information trusted by professional technicians. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Workshop Page Count Estimated Page Count: Extensive (typical for comprehensive workshop manuals, often 500+ pages) Manual Type Manual Type: Workshop Manual / Service Manual Language Language: English (common for international sales, but check specifics if possible) Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service And Repair: Full coverage including disassembly, assembly, inspection, and adjustment of all engine components. Transmission And Drivetrain: Detailed procedures for gearbox, clutch, driveshaft, and final drive maintenance and repair. Chassis And Suspension: Front forks (including BMW's monolever system), rear swingarm, shock absorbers, and steering head bearings. Braking System: Front and rear brake systems, including caliper overhauls, fluid changes, and adjustment. Electrical System: Wiring diagrams, component testing, ignition system, lighting, charging system, and starter motor. Fuel System: Carburetor service (likely Bing or similar), fuel tank, fuel lines, and fuel pump (if applicable). Exhaust System: Inspection and replacement of exhaust components. Bodywork And Frame: Minor bodywork, frame inspection, and component removal/installation. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, chain adjustment, valve clearance checks and adjustments. Troubleshooting Guides: Diagnostic procedures for common problems and symptom-based fault finding. Engine Rebuilding: Detailed steps for engine disassembly, component inspection, machining specifications, and reassembly. Suspension Overhaul: Fork seal replacement, fork oil changes, shock absorber servicing. Carburetor Tuning And Rebuild: Step-by-step instructions for carburetor cleaning, adjustment, and rebuild. Electrical Diagnostics: Testing and repair of electrical circuits, charging system issues, ignition timing adjustments. Technical Depth Depth Of Information: Comprehensive: Covers everything from basic rider maintenance to full engine and gearbox overhauls, suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality Expectation: High-resolution scans, typically black and white with clear diagrams. Printability is usually excellent. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type Consideration: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, horizontally opposed twin-cylinder (Boxer) Displacement R80: 797.5 cc Displacement R100: 980 cc Bore X Stroke R80: 82.5 mm x 75 mm (typical) Bore X Stroke R100: 94 mm x 70.7 mm (typical) Compression Ratio: 8.2:1 to 9.5:1 (varies by specific model/year) Performance Horsepower R80: ~50 hp @ 6500 rpm (estimated) Horsepower R100: ~65 hp @ 7250 rpm (estimated) Torque R80: ~57 Nm @ 5000 rpm (estimated) Torque R100: ~70 Nm @ 5500 rpm (estimated) Fuel System Carburetor Type: Typically dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model) Fuel Type: Unleaded gasoline (premium recommended) Fuel Capacity: Approx. 19-21 liters (including reserve) 🔧 Transmission Standard Transmission Type: 5-speed manual constant mesh gearbox Optional Optional Transmission: N/A (all models were manual) Features Clutch Type: Single dry plate, hydraulically actuated Final Drive: Shaft drive with enclosed universal joint and final drive unit 📐 Dimensions Exterior Length: Approx. 2230 mm Width Handlebar: Approx. 850-900 mm Height Seat: Approx. 860-900 mm (unladen, varies by suspension setting) Weights Dry Weight R80: ~192 kg Dry Weight R100: ~195 kg Gross Vehicle Weight: Approx. 360-380 kg Payload Capacity: Approx. 170-180 kg 🛡️ Safety Features Ratings Safety Ratings: Not applicable in the modern sense; focus is on mechanical integrity and rider control. Active Features Active Safety Features: Effective dual disc front brakes, single disc rear brake, robust chassis, responsive steering. Passive Features Passive Safety Features: Sturdy frame construction, rider positioned for good visibility. 💡 Technology Features Infotainment Infotainment System: N/A (This era of motorcycle...