🏷️ Basic Information Identification Make: BMW Model: R80, R90, R100 Model Variants: R80/7, R80GS, R80RT, R80ST, R90/6, R90S, R100/7, R100CS, R100GS, R100RS, R100RT, R100S, R100T Codes Engine Codes: 247 Engine (Airhead Boxer Series) 👋 Introduction Market Position Positioning: Essential diagnostic and repair guide for owners and mechanics of classic BMW airhead motorcycles Competitive Analysis Value Proposition: Provides the essential technical knowledge to maintain, repair, and restore the iconic R80, R90, and R100 series motorcycles, often at a fraction of dealership service costs. Key Features Reliability Enhancement: Detailed procedures ensure correct maintenance and repair, prolonging the life and enhancing the reliability of these classic machines. Diagnostic Capability: Equips users with the ability to diagnose and resolve a wide range of mechanical and electrical issues. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Workshop Secondary Coverage: Maintenance, Troubleshooting, Diagnostics Page Count Estimated Page Count: 300-400 Manual Type Type: Workshop Service Manual Language Language: English Format Format: Likely Printed or PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine: Full engine overhaul, component disassembly/reassembly, timing, valve adjustment, carburetor tuning, ignition system, lubrication system, cooling (air-cooled design) Transmission: Gearbox disassembly/reassembly, clutch operation, final drive, driveshaft maintenance Brakes: Hydraulic brake system service (master cylinder, calipers, lines), brake pad replacement, rotor inspection, parking brake (if applicable) Electrical: Wiring diagrams, starter system, charging system (alternator/generator), lighting, ignition, instrumentation, battery maintenance Chassis And Suspension: Fork service (oil change, seal replacement), rear shock absorber inspection/replacement, steering head bearing adjustment, wheel bearing service, swingarm maintenance Fuel System: Carburetor service (e.g., Bing, Dell'Orto), fuel tank cleaning, fuel lines, fuel pump (if applicable) Bodywork And Frame: Fairing removal/installation, seat maintenance, fender adjustments, frame inspection Procedures Included Routine Maintenance: Oil changes, filter replacement, spark plug replacement, air filter cleaning/replacement, chain adjustment (if applicable), tire pressure checks Troubleshooting: Diagnostic procedures for common starting, running, and electrical issues Repair And Rebuild: Detailed steps for component disassembly, repair, and reassembly for most major systems Technical Specifications: Torque values, clearances, timing settings, fluid types and capacities Technical Depth Depth: Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts 📊 Manual Specifications File Format Digital Format Features: Searchable text, hyperlinked sections, printable pages (if PDF) Print Quality Print Quality: Clear diagrams, legible text, durable paper (if printed) Binding Type Binding Type: Likely perfect bound or spiral bound (if printed) for lay-flat usability Paper Type Paper Type: Durable, semi-gloss or matte paper stock suitable for workshop environments (if printed) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, horizontally opposed twin-cylinder (Boxer) Bore X Stroke: Varies by model (e.g., R80: 82.5 mm x 74.5 mm, R100: 94 mm x 70.8 mm) Displacement: Approximately 798cc (R80), 897cc (R90), 979cc/1000cc (R100) Compression Ratio: Varies by model (e.g., R100S: 9.5:1) Performance Horsepower: Varies by model (e.g., R80/7: ~50 hp, R100RS: ~70 hp) Torque: Varies by model (e.g., R100S: ~75 Nm) Fuel System Carburetors: Typically dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model) Fuel Type: Unleaded gasoline (Octane rating typically 91 or higher) 🔧 Transmission Standard Type: 5-speed manual transmission Optional Type: None (standard for this era) Features Drive Type: Shaft drive (final drive) Clutch: Single dry plate, diaphragm spring operated 📐 Dimensions Exterior Wheelbase: Varies by model (e.g., R100GS ~1470 mm) Seat Height: Varies by model (e.g., R80GS ~820 mm) Weights Dry Weight: Varies by model (e.g., R100RS ~228 kg) Wet Weight: Varies by model (e.g., R100RS ~238 kg) 🛡️ Safety Features Ratings Crash Test Data: Not applicable for motorcycles of this era in the same way as cars. Active Features Braking: Disc brakes front and rear (dual discs on some R100 models), with hydraulic actuation. Passive Features Lighting: Halogen headlight, taillight, turn signals, brake light. 💡 Technology Features Infotainment Features: None (basic analogue instrumentation: speedometer, tachometer, odometer, neutral indicator, oil pressure light, turn signal indicator). Driver Assistance Features: None (focus on mechanical systems and rider control). Connectivity Features: None. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000 - 10,000 km or annually, whichever comes first (refer to manual for specific model). Valve Adjustment Interval: Typically every 10,000 - 15,000 km. Brake Fluid Change: Typically every 2 years. Fluid Specifications Engine Oil: SAE 20W-50 or SAE 15W-50 motorcycle-specific oil (e.g., Castrol GP 20W-50, BMW Recommended oils) Transmission Oil: Gear oil, e.g., SAE 80W/90 API GL-5 Final Drive Oil: Gear oil, e.g., SAE 80W/90 API GL-5 Brake Fluid: DOT 4 hydraulic brake fluid. Known Issues Common Wear Items: Fork seals, clutch plates, charging system components (rectifier, voltage regulator), starter motor brushes, fuel line degradation. Airhead Specifics: Carburetor synchronization and tuning, potential oil leaks from engine seals, electrical connector corrosion. Model Specific Notes: R100GS models can experience wear on the Monolever pivot bearings. 📚 Vehicle History Brand Heritage Bmw Motorrad Legacy: BMW Motorrad has a long history of engineering robust and reliable motorcycles, particularly known for its boxer-twin...