🏷️ Basic Information Identification Make: BMW Model: R80 GS, R100 R Year: 1979 👋 Introduction Market Position Vehicle Segment: Dual-purpose / Adventure touring motorcycle Competitive Analysis Contemporary Rivals: Honda Transalp (later), Yamaha Tenere (later), Moto Guzzi V50/V65, perhaps some larger Japanese dual-sports Key Features Engine Type: Air-cooled flat-twin (boxer) engine, known for torque and durability Drivetrain: Shaft drive, reducing maintenance compared to chain drives Suspension Gs: Long-travel suspension for off-road capability (GS models) 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Workshop Page Count Estimated Pages: Comprehensive (specific count not provided in product info, but typical for this era and scope) Manual Type Type: Workshop Manual / Service Manual Language Language: English (assumed based on common manual distribution) Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: BMW boxer twin engine (R80, R100 variants) Fuel System: Carburetor systems (e.g., Bing), fuel delivery, fuel tank, fuel lines Ignition System: Ignition timing, spark plugs, ignition coils, electronic ignition (if applicable to 1979 models) Transmission: Gearbox, clutch, driveshaft, final drive Frame And Suspension: Chassis, forks, rear shock absorbers, swingarms, steering head bearings Brakes: Front and rear braking systems (drum and disc, depending on model variant), hydraulic lines, brake fluid Electrical System: Wiring diagrams, battery, charging system (alternator, rectifier), lighting, instruments, starter motor Wheels And Tires: Wheel bearing maintenance, tire pressure specifications, wheel mounting Bodywork And Fairings: Tank, seat, fenders, side covers, any associated fairings for GS models Procedures Included Routine Maintenance: Oil changes, filter replacement, spark plug checks, chain adjustment (if applicable), brake adjustments, lubrication points Engine Overhaul: Piston/cylinder inspection/replacement, valve adjustments, crankshaft inspection, gasket replacement Transmission Service: Gearbox oil changes, clutch adjustment/replacement, final drive lubrication Suspension Repair: Fork seal replacement, shock absorber service, steering head bearing service Brake System Repair: Bleeding brakes, pad/shoe replacement, caliper/master cylinder service Electrical Troubleshooting: Diagnosis of lighting issues, charging problems, starting circuit faults Carburetor Tuning: Adjustment of fuel mixture, idle speed, jetting information Technical Depth Depth Level: Comprehensive (from basic maintenance to full engine and transmission rebuilds) Diagnostic Coverage: Troubleshooting guides, symptom-based diagnostics Rebuild Specifications: Clearances, torque values, tolerances for all major components 📊 Manual Specifications File Format PDF Quality: High-resolution (assumed for workshop manual, enabling clear diagrams and text) Searchability: Searchable text content (typical for well-produced PDF manuals) Print Quality Printable: Printable pages for workshop use Binding Type Physical Binding: N/A (PDF format) Paper Type Physical Paper: N/A (PDF format) ⚙️ Engine Specifications Primary Engine Engine Layout: Flat-twin (Boxer), air-cooled R80 Engine Displacement: 797.5 cc R100 Engine Displacement: 979.5 cc Bore X Stroke R80: 82 mm x 75 mm (approximate) Bore X Stroke R100: 94 mm x 74 mm (approximate) Compression Ratio Typical: 8.2:1 or 9.0:1 (depending on specific variant) Performance R80 Horsepower: Around 50 HP (DIN) at 6500 RPM R100 Horsepower: Around 65 HP (DIN) at 7250 RPM R80 Torque: Around 57 Nm (42 lb-ft) at 5000 RPM R100 Torque: Around 70 Nm (52 lb-ft) at 5500 RPM Fuel System Carburetor Type: Twin Bing carburetors (e.g., 32mm or 40mm depending on model) Fuel Requirement: Unleaded gasoline (91 RON minimum typically, though some earlier models may have preferred leaded or required additives) 🔧 Transmission Standard Transmission Type: 5-speed constant mesh manual gearbox Clutch Type: Dry single-plate clutch Final Drive: Shaft drive to rear wheel Features Gear Ratios: Specific ratios documented within the manual 📐 Dimensions Exterior Wheelbase R80Gs: Approx. 1450 mm (57.1 in) Wheelbase R100R: Approx. 1450 mm (57.1 in) Weights Dry Weight R80Gs: Approx. 185 kg (408 lbs) Dry Weight R100R: Approx. 190 kg (419 lbs) Fuel Capacity: Approx. 18 liters (4.75 US gal), including reserve 🛡️ Safety Features Passive Features Frame Construction: Tubular steel frame, renowned for rigidity and durability 💡 Technology Features Infotainment Instrumentation: Analog speedometer, tachometer, odometer, neutral indicator, oil pressure light, high beam indicator Driver Assistance ABS: Not applicable for 1979 models Connectivity Digital Features: Not applicable for 1979 models 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-10,000 km (3,000-6,000 miles) or annually, refer to manual for exact spec Valve Adjustment Interval: Around 10,000 km (6,000 miles) Spark Plug Replacement: Typically every 10,000-20,000 km (6,000-12,000 miles) Fluid Specifications Engine Oil Type: SAE 20W/50 or 20W/40 motorcycle-specific oil (check manual for exact viscosity and API rating) Engine Oil Capacity: Approx. 2.5 - 3.0 liters (depending on filter change) Transmission Oil Type: Gear oil, e.g., SAE 80W/90 (check manual for exact spec) Final Drive Oil Type: Gear oil, e.g., SAE 80W/90 (check manual for exact spec) Brake Fluid Type: DOT 3 or DOT 4 brake fluid (check manual for specific requirement) Known Issues Common Wear Items: Clutch wear, swingarm pivot bearings, steering head bearings, fork seals Electrical Gremlins: Potential for aging wiring harness issues, contact point corrosion Carburetor Idling: Carburetors may require regular cleaning and adjustment for smooth idling 📚 Vehicle History Brand Heritage Bmw Motorcycle Legacy: BMW's long...