The BMW R80 GS and R100 R, produced in 1978, represent a significant chapter in motorcycle engineering, offering a blend of robust performance and enduring design. These models, part of BMW's esteemed R series, are characterized by their air-cooled, four-stroke, boxer twin-cylinder engines, with displacements of approximately 800cc for the R80 and 1000cc for the R100. The R80 GS, in particular, is celebrated as the progenitor of the adventure touring motorcycle, designed for both on-road and off-road versatility. Their construction emphasizes reliability and a mechanical simplicity that has cemented their status among enthusiasts and riders seeking dependable, capable machines. This comprehensive Service Repair Workshop Manual provides essential guidance for the maintenance and repair of your BMW R80 GS or R100 R. It covers a wide array of critical systems, including detailed engine specifications, transmission overhaul, drivetrain components, chassis and suspension, and the complete electrical system. Within its pages, you will find step-by-step instructions for routine maintenance, periodic checks, and advanced troubleshooting, all presented with factory-level accuracy and detail. The manual is designed to empower owners, independent repair shops, and skilled enthusiasts to perform necessary work efficiently, ensuring the longevity and optimal performance of these iconic motorcycles. 🏷️ Basic Information Identification Make: BMW Model: R80 GS / R100 R Year: 1978 Codes Chassis Code R80: 247 (typically for R80 models) Chassis Code R100: 247 (typically for R100 models) 👋 Introduction Market Position Target Audience: BMW R80 GS and R100 R owners, independent repair shops, enthusiasts Competitive Analysis Accuracy: Factory-level accuracy and detail, surpassing generic repair guides. Key Features Visuals: Includes diagrams, illustrations, and wiring schematics. Cost Savings: Enables DIY maintenance and repairs, offering significant cost savings. User Friendliness: Step-by-step instructions make complex procedures accessible. 📋 Manual Details Coverage Areas Coverage: Comprehensive service, repair, troubleshooting, and diagnostics Page Count Estimated Page Count: Varies by specific edition, but generally extensive for workshop manuals. Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Engine specifications, removal/installation, fuel system, intake/exhaust Transmission: Transmission overhaul, maintenance, and repair Drivetrain: Drive chain, sprockets, final drive Chassis Suspension: Steering system, shocks/suspension components Electrical: Complete electrical system, wiring schematics, troubleshooting Bodywork: Bodywork repair, panels, fitment Cooling: Cooling system maintenance and repair Lubrication: Lubrication points and specifications Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug service, chain adjustment Periodic Checks: Periodic checks and adjustments for optimal performance Troubleshooting: Advanced troubleshooting guides and common issues Repair Rebuild: Step-by-step repair and rebuild procedures for major components Diagnostics: Diagnostic procedures for identifying faults Technical Depth Depth: Factory-level detail, suitable for professional mechanics and skilled enthusiasts 📊 Manual Specifications File Format File Type: PDF Compatibility: All Windows and Mac versions Print Quality Printability: Fully printable pages Binding Type Binding Type: Digital (PDF) - No physical binding Paper Type Paper Type: N/A (Digital file) Software Requirements Reader Requirement: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type R80: Air-cooled, four-stroke, boxer twin-cylinder engine Engine Type R100: Air-cooled, four-stroke, boxer twin-cylinder engine Performance Displacement R80: 797.5 cc (approx. 800cc) Displacement R100: 979.5 cc (approx. 1000cc) Bore Stroke R80: 82.5 mm x 74.5 mm (typical) Bore Stroke R100: 94 mm x 70.5 mm (typical) Compression Ratio: Typically 8.5:1 or 9.5:1 depending on variant Fuel System Carburetion: Dual Dell'Orto PHM 40 or Bing 32/40 carburetors (varies by model) Fuel Type: Unleaded gasoline (verify octane rating in manual) 🔧 Transmission Standard Type: 5-speed manual gearbox Optional Features: Shaft drive Features Clutch: Single dry plate clutch 📐 Dimensions Exterior Wheelbase: Variable, depends on specific GS or R model configuration Weights Dry Weight: Approximately 185-210 kg (varies by model and equipment) 🛡️ Safety Features Ratings Safety Features: Drum or disc brakes (depending on front/rear and specific model variant), robust frame construction. 💡 Technology Features Infotainment Infotainment System: N/A (Analog instrumentation, basic electrical systems) Driver Assistance Driver Assistance Features: N/A (Mechanical systems) Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual, typically 5,000 - 10,000 km or annually Valve Adjustment Interval: Refer to manual, typically 10,000 km Fluid Specifications Engine Oil Type: Refer to manual for specific viscosity (e.g., 20W-50, 10W-40) and API rating Gearbox Oil Type: Refer to manual for specific gear oil specification Final Drive Oil Type: Refer to manual for specific gear oil specification Known Issues Common Wear Items: Clutch wear, gearbox synchromesh (on some models), output shaft seal leaks, swingarm bearings. Electrical Quirks: Aging wiring looms, rectifier/regulator issues, contact breaker points (if applicable). Engine Considerations: Carbon buildup, potential camshaft wear on high-mileage examples. 📚 Vehicle History Brand Heritage Manufacturer: Bayerische Motoren Werke AG (BMW) Model Evolution Lineage: Part of BMW's renowned R series boxer-engined motorcycles, with the GS designation signifying its 'Gelände/Straße' (off-road/street) dual-purpose capability. Production Era: Late 1970s to early 1980s, a pivotal period for BMW's motorcycle development. 🏆...