🏷️ Basic Information Identification Make: BMW Model: R Series (R80, R90, R100) Year: 1986 Codes Engine Codes: R100 (247) 👋 Introduction Market Position Positioning: Essential technical documentation for owners and technicians working on BMW's iconic boxer twin motorcycles of the era, prized for their touring capability and robust engineering. Competitive Analysis Competitors: Competes with other marque-specific service manuals from the period (e.g., Honda CB series, Kawasaki Z series) and generic motorcycle repair guides. This manual's strength lies in its BMW-specific detail. Key Features Features: Comprehensive coverage of all major mechanical and electrical systems, detailed troubleshooting procedures, and clear illustrations/diagrams. Focus on practical repair and maintenance. 📋 Manual Details Coverage Areas Engine Overhaul: Complete Transmission Repair: Complete Electrical System: Comprehensive Chassis And Suspension: Detailed Fuel System: Thorough Braking System: Detailed Bodywork And Frame: Included Maintenance Procedures: Extensive Troubleshooting Guides: Detailed Page Count Estimated Pages: 200-300 (estimated for a comprehensive workshop manual) Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, tuning, valve adjustment, piston and cylinder inspection, crankshaft and connecting rod service. Fuel System: Carburetor (Bing) overhaul and adjustment, fuel pump, fuel lines, fuel tank servicing. Ignition System: Ignition timing, spark plugs, ignition coils, electronic ignition components (if applicable for '86 models). Transmission And Drivetrain: Gearbox disassembly and assembly, clutch service, final drive, driveshaft maintenance. Electrical System: Wiring diagrams, lighting system, battery, charging system (alternator, regulator), starter motor, instrumentation. Braking System: Brake fluid replacement, caliper service, master cylinder, brake line inspection and replacement. Suspension And Steering: Front forks (telescopic), rear swingarm and shock absorbers, steering head bearing service, wheel bearing replacement. Bodywork And Frame: Frame inspection, fairings, seat maintenance, fuel tank removal and installation. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment (if applicable to specific sub-models), lubrication points. Major Repairs: Engine rebuilds, transmission overhauls, suspension component replacement, electrical component diagnosis. Troubleshooting: Diagnostic flowcharts for common running issues, electrical faults, and mechanical problems. Component Testing: Specifications and methods for testing ignition components, charging system, and fuel system parts. Technical Depth Depth: Comprehensive, suitable for both home mechanics and professional workshops. Includes detailed exploded diagrams and torque specifications. 📊 Manual Specifications File Format Format: PDF Searchable: Yes (typically for PDF manuals) Printable: Yes Print Quality Quality: High-resolution scans, ensuring clarity of diagrams and text. Binding Type Type: N/A (Digital PDF) Paper Type Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Type: Air-cooled, four-stroke boxer twin Displacement R80: 797.5 cc Displacement R90: 897.2 cc (R90/6, R90S) Displacement R100: 979.9 cc (R100/7, R100RS, R100RT, R100CS, R100GS, R100R) Bore X Stroke R80: 82.5 mm x 74.5 mm Bore X Stroke R90: 90 mm x 70.6 mm (R90/6, R90S) Bore X Stroke R100: 94 mm x 70.6 mm (R100/7, R100RS, R100RT, R100CS, R100GS, R100R) Compression Ratio Varies: Varies by model variant (e.g., 8.2:1 to 9.5:1) Performance Horsepower R80: Approx. 50 HP (37 kW) at 6500 rpm (varies) Horsepower R90: Approx. 65 HP (48 kW) at 7000 rpm (R90S) Horsepower R100: Approx. 65-70 HP (48-51 kW) at 7000-7250 rpm (varies by model) Torque R80: Approx. 6.2 kg⋅m (61 Nm; 45 lb⋅ft) at 5000 rpm (varies) Torque R100: Approx. 7.5 kg⋅m (74 Nm; 54 lb⋅ft) at 6000 rpm (varies) Fuel System Carburetors: Typically dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model). Fuel Type: Unleaded gasoline (91 RON or higher recommended, check specific model requirements) 🔧 Transmission Standard Type: 5-speed manual, constant mesh gearbox with shaft drive Optional Type: N/A (Shaft drive was standard) Features Clutch Type: Single dry plate clutch operated by cable Gear Ratios: Specific ratios vary by model and year, detailed in the manual. Final Drive: Bevel gear drive (shaft drive) 📐 Dimensions Exterior Length: Varies by model (e.g., R100RT ~2200 mm) Width: Varies by model (e.g., R100RS ~750 mm without mirrors) Height: Varies by model (e.g., R100RT ~1400 mm) Weights Dry Weight Approx: R80: ~200 kg, R100 models: ~210-240 kg depending on configuration (RS, RT, GS). Gross Vehicle Weight: Consult specific model data sheet; typically around 400-450 kg. Fuel Capacity: Typically 18-24 liters (including reserve) depending on the fuel tank fitted. 🛡️ Safety Features Ratings Crash Safety: Not applicable for vintage motorcycle manuals in the same way as modern cars; focus is on mechanical safety and rider control. Active Features Braking: Disc brakes front and rear on most models; dual disc front often on R100 models. ABS was not a standard feature in 1986. Suspension: Responsive suspension systems contributing to stability and handling. Manual covers adjustments and maintenance. Passive Features Lighting: Halogen headlight, taillight, brake light, turn signals. Manual details bulb types and wiring. Frame Integrity: Robust steel tube frame designed for longevity and stability. Manual provides inspection guidelines. 💡 Technology Features Infotainment System: N/A (This era of motorcycles predates integrated infotainment systems. Focus...