🏷️ Basic Information Identification Make: BMW Model: R80 GS / R100 GS Model Variant: R80 GS, R100 GS Year: 1988 Codes Chassis Code Prefix: 247 👋 Introduction Market Position Segment: Dual-purpose adventure touring motorcycles. Reputation: Iconic and highly capable off-road and long-distance touring machines known for their durability and ruggedness. Competitive Analysis Competitors Era: Honda Transalp, Yamaha Tenere, Suzuki DR Big, Kawasaki KLR. Key Features Engine Type: Air-cooled, twin-cylinder Boxer engine. Suspension Front Type: Telescopic forks (some later models may feature Monolever, though the 1988 R100 GS primarily used a conventional fork, and R80GS also used conventional forks). Suspension Rear Type: Monolever single-sided swingarm. Drive Type: Shaft drive. Fuel Delivery: Dual Bing carburetors. 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Electrical System: Yes Suspension: Yes Brakes: Yes Fuel System: Yes Cooling System: Yes (Air-cooled) Frame Chassis: Yes Bodywork: Yes Troubleshooting: Yes Page Count Estimated Pages: N/A (Digital PDF) Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Full disassembly, inspection, repair, and reassembly of engine components (pistons, rings, cylinders, crankshaft, camshafts, valves, timing chain, etc.). Engine Management: Carburetor adjustment, synchronization, and overhaul (Bing carburetors common to these models). Ignition system (points, coils, spark plugs). Transmission Gearbox: Maintenance, repair, and overhaul of the 5-speed gearbox, including clutch inspection and replacement, gear selection mechanisms. Drive Shaft: Drive shaft and final drive maintenance, lubrication, and inspection. Suspension Front: BMW Telelever or conventional telescopic fork maintenance, seal replacement, oil changes, adjustment procedures. Suspension Rear: Monolever rear suspension system, shock absorber overhaul/replacement, linkage maintenance. Brakes Front: Brake caliper servicing, pad replacement, hydraulic system bleeding, master cylinder inspection. Brakes Rear: Brake drum or disc inspection and maintenance, linkage lubrication. Electrical Lighting: Headlight, taillight, turn signals, and instrument cluster maintenance and troubleshooting. Electrical Battery: Battery charging system (alternator/generator), starter motor, wiring diagrams. Electrical Ignition: Ignition timing, spark plug types, coil specifications. Fuel System Carb: Detailed settings, jetting, and maintenance for Bing carburetors. Fuel System Tank: Fuel tank removal, installation, and cleaning. Chassis Frame: Frame inspection, alignment checks, and repair procedures. Wheels Tires: Wheel bearing maintenance, tire pressure specifications, spoke tensioning. Body Panels: Fairing, tank, seat, and fender removal and installation. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, chain adjustment, brake fluid flush, battery care. Engine Rebuild: Complete step-by-step instructions for engine overhaul and component replacement. Carburetor Tuning: Detailed procedures for adjusting and synchronizing carburetors. Suspension Overhaul: Front fork and rear shock absorber servicing. Brake System Repair: Brake bleeding, pad/shoe replacement, caliper/master cylinder servicing. Electrical Diagnostics: Troubleshooting common electrical faults using wiring diagrams. Clutch Replacement: Step-by-step guide for clutch plate replacement. Wheel Bearing Service: Inspection, cleaning, repacking, and replacement of wheel bearings. Torque Specifications: Detailed torque values for critical fasteners. Technical Depth Depth: Comprehensive, covering routine maintenance to complete engine and transmission rebuilds. Includes diagnostic procedures and troubleshooting charts. 📊 Manual Specifications File Format Format: PDF Searchability: Likely text-searchable PDF, allowing for quick information retrieval. Print Quality Quality: N/A (Digital Download) Binding Type Type: N/A (Digital Download) Paper Type Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, boxer twin-cylinder engine. Displacement R80: 797.5 cc Displacement R100: 979.5 cc Bore X Stroke R80: 81 mm x 76 mm Bore X Stroke R100: 94 mm x 70.8 mm Compression Ratio R80: 8.2:1 Compression Ratio R100: 8.5:1 Performance Horsepower R80: 50 hp (37 kW) at 6,500 rpm Horsepower R100: 65 hp (48 kW) at 7,000 rpm Torque R80: 57 Nm (42 lb-ft) at 5,000 rpm Torque R100: 74 Nm (55 lb-ft) at 5,500 rpm Fuel System Carburetor: 2 x Bing 94/40 carburetors Fuel Type: Unleaded gasoline, minimum 91 octane Lubrication Oil Capacity With Filter: Approx. 3.0 liters (3.2 US qt) Oil Type: API SG or higher, SAE 20W-50 recommended (refer to manual for specific conditions). Ignition Ignition Type: Electronic ignition with dual spark plugs per cylinder 🔧 Transmission Standard Type: 5-speed constant mesh gearbox Drive Type: Shaft drive to rear wheel Features Clutch Type: Single dry plate, diaphragm spring clutch Final Drive Ratio: 3.00:1 (3.00 / 1.00) for most GS models Fluid Type Gearbox Oil: SAE 90 hypoid gear oil (refer to manual for API GL classification) 📐 Dimensions Exterior Length Approx: 2220 mm (87.4 in) Width Approx: 920 mm (36.2 in) Height Approx: 1350 mm (53.1 in) Weights Dry Weight R80: Approx. 190 kg (419 lbs) Dry Weight R100: Approx. 195 kg (430 lbs) Gross Vehicle Weight Rating Gvwr: Not typically specified for this era of motorcycle, but rider + luggage capacity is significant. Fuel Tank Capacity: 26 liters (6.9 US gal), including a 5-liter reserve Wheels Tires Front Wheel Size: 2.50 x 19 Rear Wheel Size: 4.00 x 17 Front Tire Size: 90/90-19 (or 3.00-19) Rear Tire Size: 130/80-17 (or 4.00-17) Wheel Bolt Pattern: N/A (Spoked...