🏷️ Basic Information Identification Make: BMW Model: R Series (R80, R90, R100) Product Type: Service and Repair Manual Codes Engine Codes: R80/7, R90/6, R100/7, R100S, R100RT, R100RS, R100GS, R100R 👋 Introduction Market Position Segment: Air-cooled boxer twin motorcycles, classic European motorcycles Competitive Analysis Competitors: Moto Guzzi V-twin models, Harley-Davidson Big Twin, older Japanese inline-fours Key Features Heritage: Iconic BMW boxer engine design, robust shaft drive, touring capability, off-road prowess (GS models) Target Audience: BMW R Series owners, vintage motorcycle enthusiasts, DIY mechanics, restoration projects 📋 Manual Details Coverage Areas Engine Coverage: Complete engine overhaul, tuning, carburetor adjustment, ignition system, lubrication system Transmission Coverage: Gearbox overhaul, clutch replacement, shaft drive maintenance Chassis Coverage: Frame, suspension (front forks, rear shocks), wheels, steering, braking system (drum and disc) Electrical Coverage: Wiring diagrams, lighting, ignition system, battery charging, starter motor, instrumentation Bodywork Coverage: Fenders, fuel tank, seat, fairings (where applicable), exhaust system Page Count Estimated Pages: 300-500 (typical for comprehensive service manuals of this era) Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: Downloadable Digital File (PDF) 📖 Manual Coverage Systems Covered Engine: Air-cooled flat-twin boxer engine (various displacements: 797cc, 897cc, 971cc, 980cc, 1000cc) Fuel System: Carburetor types (Dell'Orto, Bing), fuel pump, fuel lines Ignition System: Breaker point ignition, electronic ignition (depending on model year/variant) Transmission: 5-speed constant mesh gearbox Drivetrain: Shaft drive, universal joint, final drive housing Suspension: Telescopic front forks (Marzocchi, Fournales on some models), dual rear shock absorbers (Koni, Bilstein, Sachs) Brakes: Front disc brakes (single or dual), rear drum brakes (later models may have rear disc options) Electrical System: 12V system, dynamo/alternator, battery, starter motor, regulator/rectifier, lighting circuits, horn, indicators Procedures Included Scheduled Maintenance: Oil changes, filter replacements, spark plug checks, valve clearance adjustments, lubrication points, brake adjustments Troubleshooting: Diagnostic procedures for common engine, electrical, and mechanical faults Engine Rebuild: Piston and cylinder replacement, crankshaft and bearing service, camshaft and valve train overhaul Transmission Repair: Gearbox disassembly, inspection, and reassembly; clutch plate replacement Suspension Service: Fork seal replacement, shock absorber servicing and replacement Brake System Maintenance: Brake pad replacement, caliper servicing, master cylinder overhaul, brake fluid bleeding Electrical Diagnostics: Wiring harness inspection, component testing, fault finding using wiring diagrams Technical Depth Depth: Comprehensive from routine maintenance to full engine and gearbox rebuilds. Includes detailed torque specifications, clearances, and diagnostic procedures. 📊 Manual Specifications File Format Format: PDF Searchability: Text-searchable (OCR layer) Printability: Printable pages Print Quality Image Resolution: High-resolution scans of original factory documents Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Configuration: Air-cooled, four-stroke, horizontal-opposed twin-cylinder (Boxer) Bore X Stroke R80: 81 mm x 70.6 mm Bore X Stroke R90: 90 mm x 70.6 mm Bore X Stroke R100: 94 mm x 70.6 mm (approx. 980cc for R100/7, 980cc for R100T, R100CS, R100RS, R100RT; 980cc for R100GS, R100R) Displacement R80: 797.5 cc Displacement R90: 897.9 cc Displacement R100: 980.7 cc Performance Horsepower R80: 50 hp @ 6,500 rpm (approx.) Horsepower R90: 60 hp @ 6,500 rpm (approx.) Horsepower R100: 65-70 hp @ 6,250-7,000 rpm (variant dependent) Torque R80: 55 Nm @ 5,000 rpm (approx.) Torque R90: 70 Nm @ 5,000 rpm (approx.) Torque R100: 74-80 Nm @ 4,500-5,000 rpm (variant dependent) Fuel System Carburetors: Dual Dell'Orto PHM 32 A/B, or Dual Bing 54/32/34/42 (model dependent) Fuel Type: Unleaded gasoline (RON 91 or higher, depending on compression ratio) Ignition System Ignition Type: Breaker point ignition (early models), Electronic ignition (later models, e.g., Motronic on some R100 models) 🔧 Transmission Standard Type: 5-speed constant mesh gearbox Clutch: Single dry plate, diaphragm spring clutch Features Drive: Shaft drive to rear wheel 📐 Dimensions Exterior Length: Variable by model (e.g., R100RT approx. 2200 mm) Width: Variable by model (e.g., R100RT approx. 950 mm) Height: Variable by model (e.g., R100RT approx. 1450 mm) Weights Dry Weight: Approx. 200-230 kg (model dependent) Gross Vehicle Weight: Approx. 400-450 kg Fuel Tank Capacity: 24 liters (including approx. 3-4 liter reserve) 🛡️ Safety Features Ratings Crash Test Data: Not applicable (motorcycle, historical data) Active Features Braking System: Effective front disc and rear drum brakes (dual front discs on some sport/touring models) Lighting: Halogen headlight, brake light, taillight, turn signals Passive Features Frame Construction: Robust double-cradle steel frame providing stability 💡 Technology Features Infotainment Features: Analog instrumentation: speedometer, tachometer, fuel gauge, warning lights. Basic radio systems were optional on some touring models. Driver Assistance Features: None (electronic rider aids were not prevalent in this era) 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 - 10,000 km or annually (refer to manual for specifics based on oil type and usage) Valve Clearance Check: Every 10,000 km Spark Plug Replacement: Every 10,000 - 20,000 km Lubrication Points: Regular greasing of steering head bearings, swingarm pivot, and other points as specified Fluid Specifications Engine Oil...