🏷️ Basic Information Identification Make: BMW Model: R 80 GS / R 100 R Model Variant: Dual Sport / Roadster Codes Engine Codes: R80GS: Type 247/2, R100R: Type 247/1 👋 Introduction Market Position Market Position: The BMW R 80 GS and R 100 R represent the enduring legacy of BMW's air-cooled boxer-twin motorcycles, revered for their durability, versatility, and touring capability. This manual serves owners and enthusiasts seeking to maintain and repair these iconic machines. Competitive Analysis Competitive Analysis: These models competed with other large-displacement dual-sport and touring motorcycles of their era, such as the Yamaha Tenere and Honda Africa Twin. Their unique shaft drive, boxer engine layout, and robust construction set them apart. Key Features Key Features: Iconic air-cooled boxer-twin engine, shaft final drive, robust chassis, excellent touring and off-road capabilities (GS variant), strong aftermarket support. 📋 Manual Details Coverage Areas Covered Models Years: BMW R 80 GS (1987-1990), BMW R 100 R (1991-1995) Page Count Estimated Page Count: 300-400 Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine assembly/disassembly, cylinder head, valve train, piston/cylinder, crankshaft, lubrication, oil cooler, ignition system, fuel system (carburetor tuning and rebuild), exhaust system. Transmission Drivetrain: Gearbox overhaul, clutch service, driveshaft, final drive maintenance, gearbox oil specifications and replacement. Chassis Suspension: Front fork service (including oil change and seal replacement), rear shock absorber adjustment and replacement, steering head bearing service, frame inspections. Brakes: Front and rear brake system inspection and service (calipers, master cylinders, brake lines), brake fluid replacement and bleeding procedures, disc and pad wear limits. Electrical System: Wiring diagrams, battery maintenance, charging system (alternator, regulator), starter motor, lighting circuits, ignition system troubleshooting, fuse replacement. Fuel System: Carburetor identification and adjustment (e.g., Bing 32/40), jetting specifications, fuel pump service (if applicable), fuel line inspection. Procedures Included Maintenance Procedures: Scheduled maintenance intervals, oil and filter changes, spark plug replacement, air filter cleaning/replacement, valve clearance adjustment, drive belt inspection/replacement (if applicable). Repair Procedures: Step-by-step instructions for major component repairs and overhauls, including engine rebuilds, gearbox repairs, suspension component replacement, and electrical system troubleshooting. Troubleshooting Guides: Diagnostic procedures for common running issues, electrical faults, and mechanical problems, often presented in a flow-chart format. Technical Depth Technical Depth: Comprehensive coverage suitable for DIY mechanics and professional technicians, including detailed torque specifications, tolerances, and diagnostic data. 📊 Manual Specifications File Format File Format Details: High-resolution PDF, searchable text, printable pages. Print Quality Print Quality Description: Clear and crisp text and diagrams, allowing for easy readability and printing. Binding Type Binding Type: N/A (Digital PDF Download) Paper Type Paper Type: N/A (Digital PDF Download) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, air-cooled, horizontally opposed twin-cylinder (Boxer) R80Gs Engine Displacement: 797.5 cc R100R Engine Displacement: 980 cc Bore Stroke R80Gs: 84.8 mm x 70.6 mm Bore Stroke R100R: 94 mm x 70.6 mm Performance R80Gs Horsepower: Approx. 50 hp @ 6500 rpm R100R Horsepower: Approx. 60 hp @ 6500 rpm R80Gs Torque: Approx. 56 Nm (41 lb-ft) @ 5000 rpm R100R Torque: Approx. 70 Nm (52 lb-ft) @ 5000 rpm Fuel System Carburetors: Dual Bing Constant Velocity (CV) carburetors (e.g., Bing 32/40 for R80GS, Bing 40/40 for R100R) Fuel Type: Unleaded gasoline (min. 91 octane recommended) Fuel Tank Capacity R80Gs: 20 Liters (approx. 5.3 US gallons) Fuel Tank Capacity R100R: 19 Liters (approx. 5.0 US gallons) Lubrication Oil Capacity: Approx. 2.75 Liters (with filter change) Recommended Oil Grade: SAE 20W-50 or 10W-40 motorcycle specific oil (refer to manual for exact specifications based on temperature) Ignition System Ignition Type: Electronic Ignition (Bosch or similar) 🔧 Transmission Standard Gearbox Type: 5-speed constant mesh gearbox Clutch Type: Single dry plate clutch, cable operated Final Drive: Shaft drive to rear wheel Features Gearbox Oil Type: API GL-5, SAE 80W-90 gear oil Gearbox Oil Capacity: Approx. 0.25 Liters (check dipstick/level plug) 📐 Dimensions Exterior Wheelbase R80Gs: Approx. 1440 mm (56.7 inches) Wheelbase R100R: Approx. 1430 mm (56.3 inches) Weights Dry Weight R80Gs: Approx. 185 kg (408 lbs) Dry Weight R100R: Approx. 195 kg (430 lbs) Gross Vehicle Weight Rating Gvwr: Typically around 370 kg (816 lbs) - refer to VIN plate Chassis Codes Frame Type: Tubular steel Trellis frame 🛡️ Safety Features Ratings Safety Ratings: Motorcycles of this era were not subject to standardized crash testing in the same way as modern cars. Safety features are primarily passive and mechanical. Active Features Active Safety Features: Effective braking systems (disc brakes front and rear), good handling characteristics, responsive throttle. Passive Features Passive Safety Features: Robust frame construction, durable components, rider awareness is paramount. Braking Specs Front Brake: Single Disc Brake (e.g., 285 mm diameter) Rear Brake: Single Disc Brake (e.g., 200 mm diameter) Tires Front Tire Size: Typically 90/90-21 (R80GS) or 100/90-18 (R100R) - consult manual for exact fitment Rear Tire...