Target Audience:
BMW R80 owners and mechanics seeking comprehensive repair and maintenance information.
Value Proposition:
Provides expert-level guidance to empower owners for self-sufficiency in maintenance and repairs, potentially saving significant costs.
Completeness:
Emphasizes 'everything you will ever need to repair, maintain, rebuild, refurbish or restore'.
Diagnostic Emphasis:
Highlights detailed diagnostic procedures.
Engine Mechanical:
Detailed overhaul, inspection, and repair procedures for the BMW boxer twin engine.
Fuel System:
Carburetor tuning, maintenance, and rebuilds (likely for Bing carburetors).
Ignition System:
Ignition timing, component testing, and troubleshooting.
Transmission Drivetrain:
Clutch, gearbox, shaft drive maintenance and repair.
Brakes:
Front and rear brake system inspection, servicing, and component replacement (likely drum and disc systems depending on R80 variant).
Suspension Steering:
Front fork (potentially including Earles fork on some variants), rear shock absorbers, swingarm, and steering head bearing maintenance.
Electrical System:
Wiring diagrams, battery, lighting, charging system (alternator/generator), starter motor troubleshooting.
Frame Bodywork:
Frame inspection, fairing (if applicable), fenders, and related components.
Exhaust System:
Inspection, maintenance, and potential repair of the exhaust headers and mufflers.
Cooling System:
Air cooling system management.
Routine Maintenance:
Oil changes, filter replacements, valve clearance adjustment, spark plug replacement, lubrication points.
Troubleshooting Diagnostics:
Systematic diagnostic procedures for common and uncommon issues, symptom-based troubleshooting.
Component Rebuild:
In-depth instructions for rebuilding engine components, carburetors, brake calipers, and other wear items.
Adjustments:
Carburetor synchronization, clutch adjustment, brake lever adjustment, chain tension (if applicable).
Performance Tuning:
Guidance on optimizing engine performance through proper setup and maintenance.
Wheel And Tire Service:
Tire replacement, wheel balancing, and spoke tensioning.
Bodywork Refinishing:
Guidance on maintaining and repairing painted surfaces, fenders, and any fairings.
Depth Level:
Comprehensive, covering everything from basic servicing to full engine and gearbox rebuilds.
Diagnostic Detail:
Extensive diagnostic charts and procedures for identifying and resolving faults.
Torque Specifications:
Detailed torque values for all critical fasteners.
Diagrams Illustrations:
Likely includes detailed exploded diagrams, schematics, and repair illustrations.
Type:
Likely PDF (searchable, printable, digital)
Type:
Air-cooled, four-stroke boxer twin cylinder
Displacement:
797.5 cc (approx. 800cc)
Bore X Stroke:
82 mm x 75 mm (typical for R80)
Compression Ratio:
8.2:1 (typical)
Valve Train:
Overhead camshaft (OHC), pushrod actuated valves
Engine Mounting:
Horizontally opposed twin cylinders
Horsepower:
Approximately 50 hp (DIN) at 6,500 rpm (typical for R80)
Torque:
Approximately 57 Nm (42 lb-ft) at 5,000 rpm (typical for R80)
Fuel Delivery:
Gravity feed from fuel tank to carburetors.
Carburetors:
Typically dual Bing constant velocity carburetors (e.g., 32mm or 40mm, depending on R80 model variant)
Fuel Type:
Unleaded gasoline (minimum octane rating specified in manual, likely 91 RON/87 AKI)
Wheelbase:
Approximately 1,430 mm (56.3 inches)
Seat Height:
Approximately 820 mm (32.3 inches)
Length:
Approximately 2,180 mm (85.8 inches)
Width:
Approximately 800 mm (31.5 inches) at handlebars
Dry Weight:
Approximately 195-205 kg (430-452 lbs) depending on model variant
Fuel Tank Capacity:
Approximately 18-22 liters (4.75-5.8 US gallons)
Certification:
N/A (Motorcycle, safety standards vary by region and era)
Braking System:
Disc brake front, drum brake rear (standard on R80/7); R80RT and later R80 models may have dual front discs or rear disc.
Lighting:
Halogen headlight, taillight, turn signals, brake light.
Oil Change:
Typically every 5,000-7,500 km (3,000-5,000 miles) or annually.
Valve Adjustment:
Typically every 10,000 km (6,000 miles) or annually.
Spark Plug Replacement:
Typically every 10,000-15,000 km (6,000-9,000 miles).
Final Drive Service:
Regularly check and change final drive oil as per manual recommendations.
Engine Oil:
SAE 20W-50 or SAE 15W-40 (API SG or higher, consult manual for exact specs). Capacity: approx. 2.0-2.5 liters with filter change.
Gearbox Oil:
SAE 80W-90 GL-5 gear oil. Capacity: approx. 0.8 liters.
Final Drive Oil:
SAE 80W-90 GL-5 gear oil. Capacity: approx. 0.15 liters.
Brake Fluid:
DOT 3 or DOT 4 (depending on system specification, consult manual).
Common Wear Items:
Valve guides, clutch wear, fork seals, wheel bearings, swingarm bearings, gearbox input shaft seal.
Electrical Gremlins:
Potential issues with aging wiring harnesses, battery charging systems (rectifier/regulator), and starter solenoids.
Carburetor Performance:
Bing carburetors can require periodic cleaning, adjustment, and rebuild due to wear or fuel contamination.
Timing Chain Tensioner:
Some models may benefit from updated timing chain tensioners for improved longevity.
Oil Filter:
Specific part number would be listed in the manual (e.g., Mann Filter, Mahle, or original BMW).
Air Filter:
Specific part number would be listed in the manual.
Legacy:
BMW Motorrad has a long history of producing reliable, shaft-driven motorcycles known for their touring capabilities and build quality.
Lineage:
The R80 is part of the long-running BMW 'boxer' series, evolving from earlier models like the R75/5 and R90/6. It represented a balance of performance and touring comfort.
Production Period:
The R80 series was produced from 1977 to 1987, with the 1981 model being a mid-production year.
Key Variants:
R80/7, R80GS (off-road variant), R80RT (touring variant), R80ST (sport-touring variant).
