This manual covers the R80 GS and R100 GS models from 1988, iconic dual-purpose adventure touring motorcycles renowned for their durability and ruggedness. These machines, powered by air-cooled, twin-cylinder Boxer engines, feature shaft drive and a Monolever rear suspension system. With their robust tubular steel frames and substantial fuel tank capacity, they are engineered for both long-distance touring and capable off-road excursions. The 1988 iteration benefited from updates enhancing comfort and capability, building on the legacy of the R80 G/S which established the adventure touring segment. This comprehensive Service Repair Workshop Manual in English provides detailed guidance for owners and technicians. It covers a wide array of essential maintenance and repair procedures, including full engine mechanicals, transmission overhaul, carburetor tuning, electrical system diagnostics, suspension servicing, and brake system repairs. The manual offers in-depth information on routine maintenance, engine rebuilds, clutch replacement, and wheel bearing service, alongside crucial torque specifications and wiring diagrams. Its purpose is to facilitate the proper upkeep and repair of the R80 GS / R100 GS, ensuring optimal performance and longevity. 🏷️ 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...