Target Audience:
BMW R80 series owners, independent repair shops, motorcycle enthusiasts.
Value Proposition:
Comprehensive technical resource for maintaining and repairing iconic BMW airhead motorcycles.
Detail Level:
Exceptional detail for the era, covering all aspects of the motorcycle.
Iconic Status:
Focuses on the legendary BMW R80 series, known for its durability and character.
Engine Mechanical:
Full overhaul, cylinder head, pistons, crankshaft, camshaft, timing, valve adjustment, lubrication system.
Fuel System:
Carburetor (likely Bing) overhaul, tuning, fuel pump, fuel lines, fuel tank maintenance.
Ignition System:
Spark plugs, coils, timing, electronic ignition system (if applicable to specific models/years).
Transmission:
Gearbox disassembly, assembly, maintenance, clutch operation, final drive.
Brakes:
Hydraulic system, master cylinder, calipers, brake pads, brake lines, bleeding procedures, disc maintenance.
Suspension:
Front forks (telescopic), rear swingarm, shock absorbers, springs, bushings, maintenance.
Electrical System:
Wiring diagrams, battery, charging system (alternator, regulator), lighting, instrumentation, starter motor.
Chassis And Bodywork:
Frame, wheels, tires, fairings (if applicable), seat, handlebars, controls, exhaust system.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment (if applicable), valve clearance checks, lubrication points.
Troubleshooting:
Diagnostic procedures for common and uncommon issues, fault finding charts.
Repair And Rebuild:
Step-by-step instructions for component disassembly, inspection, repair, and reassembly.
Technical Specifications Data:
Torque values, clearances, fluid capacities, electrical specifications, measurements.
Diagnostic Capabilities:
Comprehensive diagnostics for engine performance, electrical faults, and mechanical issues.
Rebuild Procedures:
Detailed instructions for complete engine, gearbox, and suspension rebuilds.
Special Tool Requirements:
Identification and usage of BMW-specific or specialized tools for repairs.
Engine Type:
Air-cooled, four-stroke, boxer-twin cylinder
Displacement:
797.5 cc (approx. 800 cc)
Bore X Stroke:
Approx. 90.0 mm x 62.0 mm
Compression Ratio:
Typically around 8.2:1 to 9.5:1, depending on specific model variant
Valve Train:
Overhead camshaft (OHC), pushrod actuated valves
Horsepower:
Approx. 50-55 hp @ 6500 rpm (depending on variant and tuning)
Torque:
Approx. 60-65 Nm (44-48 lb-ft) @ 4500 rpm (depending on variant)
Carburetion:
Dual Bing carburetors (e.g., 32mm or 40mm, depending on model)
Fuel Type:
Unleaded gasoline (minimum 90 RON, or Premium Unleaded)
Transmission Type:
5-speed, constant mesh, shaft drive
Gearbox Ratio Options:
Specific ratios vary by model R80, R80G, R80S; manual will detail these.
Clutch:
Single dry plate, cable-actuated
Final Drive:
Shaft drive, enclosed universal joint
Infotainment Systems:
N/A (Pre-digital era, focus on mechanical and electrical functionality)
Driver Assistance Features:
N/A (Basic motorcycle controls)
Ignition System Technology:
Mechanical breaker points or early electronic ignition systems (e.g., Motronic, depending on specific year/model variant).
Oil Change Interval:
Typically every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually. Manual will specify.
Valve Adjustment Interval:
Every 10,000 km (6,000 miles) or as specified in the manual.
Engine Oil Type:
Mineral or semi-synthetic motorcycle oil, SAE 20W-50 or 15W-40 often recommended. Manual will have precise BMW specification.
Engine Oil Capacity:
Approx. 2.5 - 3.0 liters (2.6 - 3.2 US quarts) including filter. Manual confirmation needed.
Transmission Oil Type:
Hypoid gear oil, SAE 80W-90 (API GL-5) for gearbox and final drive. Manual confirmation needed.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid. Manual confirmation needed.
Common Wear Items:
Clutch wear, exhaust gasket leaks, fork seal leaks, rear shock absorber deterioration, carburetors requiring periodic adjustment.
Electrical Aging:
Aging wiring harness, brittle connectors, and potential issues with voltage regulators are common in older models.
Carburetor Tuning:
Bing carburetors require meticulous synchronization and jetting for optimal performance.
Bmw Motorcycle Legacy:
BMW's long-standing reputation for engineering excellence, durability, and shaft-driven motorcycles.
Airhead Platform:
R80 series based on the highly successful 'airhead' boxer twin platform, evolving from earlier R75 and R100 models.
R80 Variants:
R80 (standard tourer), R80G (off-road/dual-sport variant, often with larger front wheel and different suspension), R80S (sportier variant).
Manufacturing Location:
Berlin, Germany (BMW Motorrad plant)
