🏷️ Basic Information Identification Make: BMW Model: R80, R90, R100 Model Variants: R80/7, R80RT, R80G/S, R90/6, R90S, R100/7, R100RT, R100RS, R100GS, R100R Codes Production Code Range: Covering models produced between 1978 and 1986 👋 Introduction Market Position Target Audience: BMW airhead motorcycle owners and independent workshops specializing in vintage BMW motorcycles. Competitive Analysis Value Proposition: Provides essential technical data, troubleshooting, and repair procedures for a significant period of BMW's air-cooled motorcycle production, enabling owners to maintain and repair their classic machines. Key Features Vintage Coverage: Specifically covers the highly regarded R80, R90, and R100 series, which are iconic in BMW motorcycle history. Completeness: Promises 'complete' coverage, implying all essential aspects of maintenance and repair are included. 📋 Manual Details Coverage Areas Manual Coverage: Complete Workshop Service Repair Diagnostic Flowcharts: Likely includes step-by-step diagnostic flowcharts for common problems. Technical Bulletins: May include reference to or summary of factory technical service bulletins relevant to these models. Page Count Estimated Page Count: Refer to specific edition/format for exact count, typically 500+ pages for comprehensive coverage Manual Type Manual Type: Service and Repair Manual Language Language: English (Assumed based on common availability for this market) Format Format: Downloadable Digital Format (PDF) 📖 Manual Coverage Systems Covered Engine Overhaul: Detailed procedures for disassembly, inspection, repair, and reassembly of Boxer twin-cylinder engines (R80, R90, R100 variants). Fuel System Service: Carburetor tuning, maintenance, and repair (Dell'Orto, Bing), fuel pump, fuel lines, and tank. Ignition System: Ignition timing, coil testing, spark plug specifications, CDI unit diagnostics. Transmission And Drivetrain: Gearbox inspection, maintenance, repair, clutch service, driveshaft and final drive maintenance. Suspension And Steering: Fork disassembly, seal replacement, damper servicing, rear shock absorber adjustments and replacement, steering head bearing maintenance. Braking System: Brake caliper overhaul, pad replacement, fluid bleeding, master cylinder servicing, disc and drum brake maintenance. Electrical System: Wiring diagrams, starter motor, alternator, battery maintenance, lighting system, switches, and instrumentation troubleshooting. Bodywork And Chassis: Frame inspection, body panel removal and installation, seat, fairing (if applicable), and luggage system maintenance. Cooling System: Although air-cooled, the manual covers oil cooling systems (if applicable to specific variants) and related components. Exhaust System: Maintenance and repair of exhaust headers, mufflers, and associated fittings. Wheels And Tires: Information on wheel bearing maintenance, spoke wheel truing, and tire size recommendations. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug service, chain adjustment, brake fluid checks. Troubleshooting Guides: Diagnostic charts and procedures for common problems and failures. Engine Rebuilds: Complete engine disassembly, component inspection (pistons, cylinders, valves, crankshaft), and reassembly with torque specifications. Carburetor Recalibration: Step-by-step instructions for synchronizing, jetting, and rebuilding carburetors for optimal performance. Electrical Diagnostics: Testing of charging system, ignition components, starter motor, and auxiliary circuits using multimeters and specified procedures. Suspension Overhaul: Detailed instructions for rebuilding front forks and servicing rear shock absorbers. Clutch Replacement: Procedure for clutch disc replacement and inspection of clutch components. Wheel And Tire Service: Wheel bearing maintenance, tire mounting and balancing, and spoke tensioning. Torque Specifications: Critical torque values for engine, chassis, and electrical components provided for accurate assembly. Technical Depth Depth Of Coverage: Comprehensive from basic maintenance to full engine and transmission rebuilds. Diagnostics Capability: Includes procedures for diagnosing electrical faults, fuel system issues, and mechanical wear using standard tools and specifications. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable if professionally scanned. File Size: Variable, typically 50MB - 200MB for high-quality scanned PDFs. Print Quality Image Resolution: High-resolution, suitable for printing key diagrams and schematics. Binding Type Binding: Not applicable (Digital download) Paper Type Paper Quality: Not applicable (Digital download) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, horizontally opposed twin-cylinder (Boxer) Bore X Stroke: Varies by model: R80 (82mm x 74.5mm), R90 (90mm x 70.6mm), R100 (94mm x 70.6mm) Displacement: Varies by model: R80 (797cc), R90 (897cc), R100 (979-1000cc) Compression Ratio: Varies by model and variant, typically between 8.5:1 and 10.0:1 Valve Train: Overhead valves (OHV) operated by pushrods and rocker arms. Lubrication System: Wet sump lubrication system with oil filter. Performance Horsepower Range: Approx. 50-70 HP depending on model and tuning. Torque Range: Approx. 55-70 Nm depending on model. Fuel System Carburetors: Typically dual Dell'Orto PHM 38/40 or Bing 32/40 carburetors, depending on model and year. Fuel Type: Unleaded gasoline, minimum octane rating as specified by BMW (typically 95 RON or higher). 🔧 Transmission Standard Transmission Type: 5-speed manual gearbox Optional Optional Gearbox: N/A (All models feature a 5-speed manual) Features Clutch Type: Single dry plate, diaphragm spring Final Drive: Shaft drive 📐 Dimensions Exterior Wheelbase: Varies by model, typically around 1465mm - 1500mm Weights Dry Weight: Varies by model, typically between 200kg and 230kg 🛡️ Safety Features Ratings Safety Certifications: N/A (Vehicles of this era did not have standardized crash ratings as we know them today). Active Features Braking System Type: Disc brakes front and rear...