🏷️ Basic Information Identification Make: BMW Model: R80, R90, R100 Series Year: 1985 Codes Chassis Codes: R80/7, R90S, R100/7, R100RS, R100RT, R100CS, R100GS (early models), R100R (early models) Engine Codes: Type 247 (Airhead Boxer Twin) 👋 Introduction Market Position Market Position: Essential documentation for owners and mechanics of classic BMW airhead motorcycles, supporting models that defined a generation of touring and everyday motorcycling. Competitive Analysis Competitive Analysis: This factory manual provides the highest level of accuracy and detail compared to aftermarket manuals, covering all variations and technical nuances specific to BMW's engineering for these models. Key Features Key Features: Official factory content, comprehensive coverage, detailed diagrams, troubleshooting guides, printable format. Target Audience Target Audience: BMW motorcycle owners, independent repair shops, motorcycle restoration specialists. 📋 Manual Details Coverage Areas Coverage Areas: All major mechanical, electrical, and bodywork components for the specified models. Page Count Page Count: Hundreds of pages (specific count not provided but implied to be comprehensive). Manual Type Manual Type: Factory Service Repair Manual (FSM) Language Language: English (implied by product description and target market) Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: Engine teardown, reassembly, component inspection, tuning, lubrication, cooling system. Transmission: Gearbox disassembly, reassembly, clutch service, final drive inspection and repair. Electrical: Ignition system, charging system, lighting, wiring diagrams, starter motor, battery service. Brakes: Brake system overhaul, fluid replacement, caliper service, master cylinder. Suspension: Front fork (telescopic and possibly Monolever for later models if applicable to '85), rear shock absorber service, swingarm. Chassis Bodywork: Frame inspection, body panel removal and installation, seat, fuel tank, fairings (if equipped). Wheels Tires: Wheel bearing service, spoke tensioning, tire replacement, rim inspection. Procedures Included Maintenance: Scheduled maintenance tasks, oil changes, filter replacements, valve adjustments, spark plug replacement. Troubleshooting: Diagnostic procedures for common mechanical and electrical faults. Repair: Step-by-step instructions for component disassembly, repair, and reassembly. Technical Specifications: Torque values, clearances, fluid capacities, electrical specifications. Rebuilds: Detailed procedures for engine and gearbox rebuilds. Technical Depth Technical Depth: Comprehensive, from basic maintenance to complete engine and transmission overhauls. Diagnostic Procedures: In-depth diagnostic trees and fault-finding guides. Wiring Diagrams: Detailed, color-coded (if original) electrical schematics. 📊 Manual Specifications File Format File Format: PDF Searchable Text: Typically yes for factory PDFs, enabling quick access to information. Print Quality Print Quality: High resolution, allowing for clear printing of diagrams and text. Binding Type Binding Type: N/A (Downloadable PDF - user dependent for physical binding). Paper Type Paper Type: N/A (Downloadable PDF - user dependent for physical printing). ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, horizontally opposed twin-cylinder boxer engine. Bore X Stroke: R80: 82mm x 74.6mm; R90/6 & R90S: 90mm x 70.6mm; R100: 94mm x 70.6mm Displacement: R80: 797.5cc; R90/6 & R90S: 897.9cc; R100: 979.7cc Compression Ratio: Varies by model and year, typically 8.5:1 to 9.5:1 Performance Horsepower: R80: ~50 hp; R90S: ~65 hp; R100/7: ~60 hp; R100RS/RT: ~70 hp Torque: Specific values vary, but indicative of strong low-to-mid range torque delivery. Fuel System Carburetors: Typically Bing constant-velocity (CV) carburetors. R80: 32mm; R90S: 32mm or 40mm Dell'Orto (S model); R100 series: 32mm or 40mm Fuel Type: Unleaded gasoline (from 1985 onwards, premium unleaded typically recommended due to compression ratios). Engine Components Valves: 2 valves per cylinder, pushrod operated overhead valves (OHV). 🔧 Transmission Standard Transmission Type: 5-speed constant mesh gearbox. Clutch: Dry single-plate clutch (except early R90S with wet clutch). Drive Type: Shaft drive to rear wheel. Features Gear Ratios: Specific ratios vary by model and are detailed within the manual. Fluid Specifications Gearbox Oil Type: Typically SAE 80W/90 hypoid gear oil. 📐 Dimensions Exterior Wheelbase: Varies by model, approximately 1460-1500 mm. Seat Height: Varies by model and suspension, typically around 780-820 mm. Weights Dry Weight: Varies significantly by model, generally 190-220 kg. Gross Vehicle Weight Rating: Typically around 350-380 kg. Cargo Luggage Options: Many models were equipped with factory luggage racks and optional panniers/top cases; manual covers mounting and service. 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycles are not typically subjected to formal crash test ratings like cars). Active Features Brakes: Front: Dual Disc Brake (R100RS/RT, R90S) or Single Disc Brake (R80/7, R100/7). Rear: Single Disc Brake (most models) or Drum Brake (early models). Suspension Features: Anti-dive mechanisms on some front forks (e.g., Earles fork variants, early Monolever systems) for improved braking stability. Passive Features Lighting: Halogen headlight, taillight, brake light, turn signals. Frame Construction: Robust tubular steel frame designed for stability and durability. 💡 Technology Features Infotainment Infotainment System: Not applicable; these are classic motorcycles focused on core motorcycling experience. Driver Assistance Driver Assistance Features: Not applicable; focus is on rider input and mechanical feedback. Connectivity Connectivity Options: Not applicable. Ignition System Ignition Type: Battery-coil ignition, often with breaker points or early electronic ignition systems. Lighting Headlight Type: Halogen sealed beam units, size and wattage varies by model. 🔧 Maintenance...