🏷️ Basic Information Identification Make: BMW Model: R80 / R90 / R100 Year: 1979 Codes Chassis Codes: R80/7, R90/6, R100/7, R100S, R100RS, R100RT (applicable variants) 👋 Introduction Market Position Target Audience: Owners and mechanics of vintage BMW Airhead motorcycles seeking detailed repair and maintenance information. Competitive Analysis Manual Value: Provides factory-level accuracy and detail often superior to aftermarket manuals. Key Features Completeness: Covers all major mechanical and electrical systems specific to the 1979 R80, R90, and R100 models. Print Flexibility: Allows users to print the entire manual or specific sections as needed. 📋 Manual Details Coverage Areas Systems Covered: Engine, Transmission, Drivetrain, Chassis, Electrical System, Fuel System, Brake System, Suspension, Bodywork, Tools & Equipment, Troubleshooting. Page Count Estimated Pages: 500+ Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Overhaul: Detailed procedures for engine disassembly, inspection, repair, and reassembly for all boxer twin variants. Transmission Service: Comprehensive guides on gearbox removal, inspection, component replacement, and adjustment. Drivetrain Maintenance: Shaft drive system maintenance, universal joint inspection, and final drive unit servicing. Electrical Diagnostics: Wiring diagrams, troubleshooting guides for ignition, lighting, charging systems, and starter motor. Fuel System Repair: Carburetor (Dell'Orto/Bing) adjustment, rebuilding, fuel tank and line maintenance, and fuel pump operation. Brake System Overhaul: Disc brake pad replacement, caliper servicing, brake fluid bleeding, and drum brake adjustments (if applicable). Suspension Geometry: Front fork (telescopic) servicing, rear shock absorber replacement, and steering head bearing adjustment. Bodywork Restoration: Panel removal and installation, fairing (if equipped) repair, seat and tank mounting procedures. Ignition System: Points, condenser, coil, and spark plug troubleshooting and adjustment. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, valve clearance adjustments, carburetor synchronization. Troubleshooting Guides: Systematic diagnostic procedures for common and uncommon problems. Rebuilding Procedures: Complete step-by-step guides for major component overhauls. Technical Data Tables: Torque specifications, clearances, fluid capacities, electrical resistance values. Electrical Schematics: Detailed, factory-quality wiring diagrams for all electrical components. Torque Specs: Comprehensive torque specifications for all critical fasteners. Technical Depth Depth Of Coverage: Comprehensive, covering from basic rider maintenance to full engine and gearbox rebuilds, suitable for professional mechanics and skilled DIY enthusiasts. Diagnostic Tools: Includes instructions for using specialized BMW tools where applicable. 📊 Manual Specifications File Format File Type: PDF Print Quality Resolution: High-resolution scans ensuring clarity of diagrams and text. Binding Type Binding: N/A (Downloadable PDF) Paper Type Paper: N/A (Digital Format) Searchability Text Search: Searchable text within PDF for quick information retrieval. ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, boxer-twin cylinder Displacement R80: 797 cc Displacement R90: 897 cc Displacement R100: 980 cc Performance Bore X Stroke R80: 82.5 mm x 74.5 mm Bore X Stroke R90: 90 mm x 70.6 mm Bore X Stroke R100: 94 mm x 70.6 mm Compression Ratio Typical: 8.2:1 to 9.5:1 (model dependent) Fuel System Carburetor Type: Dual Bing constant velocity carburetors (e.g., 32/36/40/42mm) or Dell'Orto Fuel Type: Unleaded gasoline (87 octane or higher) Fuel Delivery: Gravity feed from fuel tank, electric or mechanical fuel pump (model dependent) Lubrication Oil Type: SAE 20W-50 or SAE 10W-40 motorcycle specific oil Oil Capacity Approx: 2.5 - 3.0 liters (including filter) 🔧 Transmission Standard Gearbox Type: 5-speed constant mesh, sequential manual transmission Optional Final Drive: Shaft drive (single universal joint) Features Clutch Type: Single dry plate, diaphragm spring clutch Gear Ratios: Specific ratios vary by model, detailed in manual 📐 Dimensions Exterior Wheelbase Approx: 1460 mm - 1480 mm (model dependent) Weights Dry Weight Approx: 190 kg - 225 kg (model dependent) 🛡️ Safety Features Ratings Safety Features: Focus on mechanical systems, no electronic safety ratings typically associated with this era. Active Features Braking System: Front: Single or Dual Disc Brake; Rear: Disc Brake (most models) or Drum Brake (some early variants). Passive Features Frame Construction: Steel tubular frame providing robust chassis integrity. 💡 Technology Features Infotainment Infotainment Features: N/A (mechanical era, focus on rider-machine interface). 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 - 10,000 km or annually, whichever comes first (refer to manual for specifics). Valve Adjustment Interval: Every 10,000 - 20,000 km (manual provides precise figures). Carburetor Sync Interval: As needed, typically every 10,000 - 20,000 km or if performance issues arise. Fluid Specifications Transmission Oil Type: SAE 75W/90 or SAE 80W/90 API GL-5 gear oil Final Drive Oil Type: SAE 75W/90 or SAE 80W/90 API GL-5 gear oil Brake Fluid Type: DOT 3 or DOT 4 (ensure compliance with original specifications) Known Issues Common Wear Items: Clutch wear, output shaft seal leaks, charging system (rectifier/regulator) issues, carburetor needle wear. Prevention Tips: Regular maintenance as per manual, proper warm-up procedures, and avoiding over-revving. 📚 Vehicle History Brand Heritage Bmw Motorrad Legacy: BMW Motorrad's reputation for durable, reliable, and technologically advanced motorcycles. Model Evolution Airhead Development: Evolution of BMW's iconic boxer...