🏷️ Basic Information Identification Make: BMW Model: R80 GS / R100 GS Year: 1985 Codes Chassis Code: 247 Engine Code Prefix: 247 👋 Introduction Market Position Category: Dual-sport motorcycle Segment: Adventure touring, off-road capable touring Competitive Analysis Competitors 1985: Honda Transalp (later), Yamaha Tenere, Suzuki DR series, Kawasaki KLR Key Features Engine Type: Air-cooled boxer twin Drive System: Shaft drive Suspension R100Gs: Monolever rear suspension (single-sided swingarm) Suspension R80Gs: Traditional twin rear shock absorbers Durability: Renowned for robustness and long-distance touring capability Off Road Capability: Designed with significant off-road prowess for its era 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Chassis: Yes Electrical System: Yes Suspension: Yes Brakes: Yes Bodywork: Yes Fuel System: Yes Exhaust System: Yes Wheels And Tires: Yes Troubleshooting: Yes Page Count Estimated Pages: 300+ Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Full overhaul, cylinder head, pistons, crankshaft, timing, valve train Engine Management: Ignition system, fuel injection (K-Jetronic for R100, Bing carburetors for R80), starting system, charging system Transmission Gearbox: Disassembly, assembly, gear inspection, shifting mechanism Drivetrain: Clutch (single plate dry), driveshaft, universal joints, rear axle, final drive Frame And Suspension: Frame inspection and repair, front fork (telescopic), rear swingarm, shock absorbers (Monolever for R100GS, twin shocks for R80GS) Braking System: Front and rear brake systems (disc brakes), hydraulic lines, master cylinders, calipers, bleeding procedures Electrical System: Wiring diagrams, lighting system, instrumentation, battery, starter motor, alternator, ignition coils, fuses Fuel And Exhaust: Fuel tank, fuel pump, fuel lines, carburetor overhaul (R80GS), K-Jetronic fuel injection troubleshooting (R100GS), exhaust system components Procedures Included Routine Maintenance: Oil changes, filter replacement, spark plug checks, chain adjustment (if applicable, though these are shaft-driven), valve clearance adjustments, lubrication points Component Overhaul: Complete engine rebuild, gearbox rebuild, carburetor servicing, fuel injection system servicing, brake caliper overhaul, suspension component rebuild Troubleshooting Diagnostics: Step-by-step diagnostic procedures for common starting, running, and electrical issues, fault finding charts Torque Specifications: Detailed torque values for all critical fasteners and components Wiring Diagrams: Comprehensive electrical schematics for all systems Special Tools: Identification and usage of BMW-specific tools required for certain procedures Technical Depth Depth: Comprehensive: Covers everything from basic maintenance to full engine and transmission rebuilds, including advanced diagnostics and electrical system repair. 📊 Manual Specifications File Format Format: PDF Searchability: Likely text-searchable, enabling quick access to specific information Print Quality: Dependent on original source, typically clear and legible for printing Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Type: Four-stroke, air-cooled boxer twin Bore X Stroke R80: 80.0 mm x 78.0 mm Bore X Stroke R100: 94.0 mm x 70.5 mm Displacement R80: 797.5 cc Displacement R100: 980 cc Compression Ratio R80: 8.2:1 Compression Ratio R100: 8.5:1 Horsepower R80: 50 hp @ 6500 rpm (approx.) Horsepower R100: 65 hp @ 7250 rpm (approx.) Torque R80: 57 Nm @ 5000 rpm (approx.) Torque R100: 78 Nm @ 6000 rpm (approx.) Fuel System R80Gs Carburetor: 2 x Bing 32mm constant-vacuum carburetors R100Gs Fuel Injection: Bosch L-Jetronic (K-Jetronic) fuel injection system Fuel Type: Unleaded gasoline (91 octane or higher) Lubrication System: Wet sump Ignition System: Breakerless electronic ignition 🔧 Transmission Standard Type: 5-speed constant mesh gearbox Features Drive: Shaft drive to rear wheel Clutch: Single plate, dry type, hydraulically operated 📐 Dimensions Exterior Length Approx: 2200 mm Width Approx: 900 mm Height Approx: 1400 mm Weights Dry Weight R80: 200 kg (approx.) Dry Weight R100: 207 kg (approx.) Wet Weight R80: 215 kg (approx.) Wet Weight R100: 222 kg (approx.) Gross Vehicle Weight Rating: 370 kg (approx.) Fuel Tank Capacity: 20 Liters (incl. 3L reserve) 🛡️ Safety Features Ratings Safety Rating: N/A (Motorcycle safety standards of the era) Active Features Brakes: Dual 285mm front discs, single 200mm rear disc (R100GS has dual front discs as standard, R80GS often single front disc) Suspension Stability: Paralever (on later R100GS models, not 1985) / Monolever (on 1985 R100GS) and well-engineered conventional suspension contribute to stability. Passive Features Frame Strength: Robust steel tube frame construction Lighting: Halogen headlamp, integrated turn signals and taillight 💡 Technology Features Infotainment Infotainment System: Not applicable for this model year. Driver Assistance Driver Assistance Systems: Not applicable for this model year. Connectivity Connectivity Features: Not applicable for this model year. 🔧 Maintenance Service Intervals Oil Change Engine: Every 5,000 - 10,000 km or annually Oil Change Final Drive: Every 10,000 - 20,000 km Valve Clearance Check: Every 10,000 km Spark Plug Check: Every 10,000 km Fluid Specifications Engine Oil Type: SAE 20W-50 or SAE 15W-40 motorcycle-specific oil (API SG or higher) Engine Oil Capacity: Approx. 2.5 - 3.0 liters (depending on filter change) Final Drive Oil Type: SAE 80W-90 hypoid gear oil (API GL-5) Final Drive Oil Capacity: Approx. 0.25 liters Brake Fluid Type:...