🏷️ Basic Information Identification Make: BMW Model: R90S Related Models: R60/6, R75/6, R90/6 Generation Model Generation: /6 Series Codes Engine Code: 193 (R90S) 👋 Introduction Market Position Positioning: A critical resource for owners and restorers of classic BMW motorcycles from the /6 series, particularly the flagship R90S. Positions itself as the authoritative and indispensable guide for maintaining and repairing these iconic machines. Competitive Analysis Alternatives: While aftermarket manuals exist, this is presented as the 'COMPLETE official BMW /6 service manual,' implying superior accuracy, detail, and factory-specific procedures compared to Haynes or Clymer publications. The digital format also offers advantages over older, potentially outdated printed versions. Key Features Features: Hundreds of pages, hundreds of photos/illustrations, detailed substeps, notes/cautions/warnings, numbered instructions, bold figure numbers, enlarged insets, and comprehensive electrical troubleshooting with wiring diagrams. 📋 Manual Details Coverage Areas Coverage: Complete service and repair for BMW R60/6, R75/6, R90/6, and R90S motorcycles across all production model years within the /6 series. Page Count Pages: Hundreds (printable in entirety or by section) Manual Type Type: Official BMW Factory Service Manual / Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine: Detailed disassembly, assembly, tuning, troubleshooting, and repair of the boxer twin engine, including components like cylinders, pistons, crankshaft, camshaft, valves, timing, lubrication system, and cooling system (air-cooled). Fuel System: Carburetor (likely Bing) tuning, adjustment, overhaul, and troubleshooting; fuel tank, fuel lines, and fuel pump (if applicable). Electrical System: Comprehensive coverage including ignition system (points, coils, spark plugs), charging system (alternator, regulator), lighting, starter motor, battery, wiring harnesses, and detailed wiring diagrams for fault diagnosis and repair. Drivetrain: Clutch operation and adjustment, gearbox (transmission) disassembly, assembly, and repair, driveshaft, universal joints, and final drive (rear axle). Chassis And Suspension: Front fork (telescopic) overhaul, adjustment, and repair; rear shock absorber and swingarm inspection and service; wheel bearings and steering head bearings. Brakes: Front and rear brake system service, including caliper overhaul, pad replacement, master cylinder repair, brake fluid changes, and adjustment. Bodywork And Frame: Frame inspection, body panel removal and installation, seat, fenders, fuel tank mounting, and general cosmetic component service. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks and replacement, valve adjustments, ignition timing checks, carburetor synchronization, chain adjustment (if applicable), brake fluid flush, and lubrication points. Troubleshooting: Systematic diagnostic procedures for common and uncommon problems across all vehicle systems, including engine performance issues, electrical faults, and braking system anomalies. Repair And Rebuild: Step-by-step instructions for complete disassembly and reassembly of major components, including engine internals, gearbox, forks, and brake systems. Electrical Diagnostics: Detailed guidance for diagnosing and repairing electrical issues, including the use of wiring diagrams, multimeter testing, and component-specific troubleshooting. Technical Depth Depth: Comprehensive, covering basic maintenance to full engine and transmission rebuilds. Suitable for both novice and experienced mechanics. 📊 Manual Specifications File Format Format: PDF (.pdf) Compatibility: Compatible with all PC-based Windows operating systems and Mac. Print Quality Printability: All pages are printable, allowing for a physical copy or targeted printing of specific procedures. Binding Type Binding: Digital (no physical binding, user prints as needed) Paper Type Paper Type Recommendation: For optimal durability and readability when printed, consider using heavier weight paper (e.g., 20-24 lb bond) for procedures that require frequent reference or handling. ⚙️ Engine Specifications Primary Engine Type: Air-cooled, four-stroke, boxer-twin cylinder Displacement: 897.7 cc (for R90S) Performance Horsepower: 67 hp (DIN) @ 7,000 rpm (for R90S) Torque: 77.4 Nm (57.1 lb-ft) @ 5,500 rpm (for R90S) Fuel System Carburetors: 2 x Bing 32/40/503-40 or 32/40/503-42 (for R90S) Ignition System: Battery-coil, dual ignition (dual spark plugs per cylinder for R90S) 🔧 Transmission Standard Type: 5-speed manual Features Drive Type: Shaft drive Clutch: Single dry plate 📐 Dimensions Exterior Wheelbase: Approx. 1460 mm (for R90S) Weights Dry Weight: Approx. 215 kg (for R90S) 🛡️ Safety Features Features Brakes Front: Dual disc brakes (R90S standard) with twin-piston calipers Brakes Rear: Single disc brake (R90S standard) with twin-piston caliper Lighting: Headlight, taillight, brake light, turn signals 💡 Technology Features Infotainment Features: N/A (Classic motorcycle, no modern infotainment systems) Driver Assistance Features: N/A (Classic motorcycle, no electronic driver assistance) Connectivity Features: N/A (Classic motorcycle, no connectivity) 🔧 Maintenance Service Intervals Oil Change: Typically every 3,000-5,000 miles (or annually), check manual for exact specification. Oil filter replacement often coincides with oil changes. Valve Adjustment: Generally recommended every 6,000-10,000 miles. Specific interval will be detailed in the manual. Ignition Timing: Check and adjust at major service intervals, typically coinciding with valve adjustments. Precise timing marks and procedures will be in the manual. Fluid Specifications Engine Oil: Typically SAE 20W-50 or SAE 20W-40, depending on climate. Manual will specify exact viscosity and API rating. Capacity approx. 2.5 liters. Brake Fluid: DOT 3 or DOT 4, depending on original specification. Manual will confirm. Gearbox Oil: Typically SAE...