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BMW R80 R90 R100 1979 Service Repair Workshop Manual
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Basic Information Identification Make: BMW Model: R80, R90, R100 Model Variant: Airhead Series Year: 1979 Codes Engine Code R80: 247 Engine Code R90: 248 Engine Code R100: 247 Introduction Market...
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| Basic Information | |
| Identification | |
| Make: | BMW |
| Model: | R80, R90, R100 |
| Model Variant: | Airhead Series |
| Year: | 1979 |
| Codes | |
| Engine Code R80: | 247 |
| Engine Code R90: | 248 |
| Engine Code R100: | 247 |
| Introduction | |
| Market Position | |
| Positioning: | Essential resource for owners and mechanics of iconic BMW 'Airhead' motorcycles, crucial for maintaining classic performance and longevity. |
| Competitive Analysis | |
| Competitors: | Factory service manuals from BMW, Haynes, Clymer (often less detailed). |
| Key Features | |
| Features: | Detailed diagrams, step-by-step instructions, troubleshooting guides, comprehensive specifications. |
| Value Proposition | |
| Value: | Empowers owners to perform DIY maintenance and repairs, saving costs and preserving the value of their vintage BMWs. |
| Manual Details | |
| Coverage Areas | |
| Primary Coverage: | Service, Repair, Workshop |
| Secondary Coverage: | Maintenance, Troubleshooting, Diagnostics, Overhaul |
| Page Count | |
| Estimated Page Count: | 300-400 (estimated, actual may vary) |
| Manual Type | |
| Type: | Service Repair Workshop Manual |
| Language | |
| Language: | English |
| Format | |
| Format: | Likely Printed, PDF version may be available |
| Manual Coverage | |
| Systems Covered | |
| Engine: | Complete overhaul, tuning, carburetor service (Bing), ignition system, lubrication system, cooling system (air-cooled). |
| Transmission: | 5-speed gearbox overhaul, clutch service, drive shaft, final drive unit. |
| Chassis Suspension: | Front forks (BMW Telelever/Mono-lever variations may require supplemental data), rear swingarm, shock absorbers, steering head bearing. |
| Brakes: | Front disc brake system (including caliper rebuild, hydraulic lines), rear drum brake system. |
| Electrical System: | Wiring diagrams, alternator, starter motor, battery, lighting system, instrumentation. |
| Fuel System: | Fuel tank, fuel lines, petcock, carburetor tuning and rebuilding. |
| Bodywork Frame: | Frame inspection, body panel removal and installation, seat, fuel tank mounting. |
| Procedures Included | |
| Maintenance Procedures: | Regular servicing, oil changes, filter replacements, spark plug service, valve adjustments, carburetor synchronization. |
| Repair Procedures: | Engine rebuilds, transmission overhauls, brake caliper servicing, fork seal replacement, electrical component repair. |
| Troubleshooting: | Diagnostic flowcharts for common issues, ignition problems, fuel delivery issues, starting problems. |
| Torque Specifications: | Detailed torque values for all critical fasteners. |
| Technical Depth | |
| Depth: | Comprehensive: Covers everything from basic scheduled maintenance to full engine and transmission rebuilds, including detailed electrical system diagnostics. |
| Manual Specifications | |
| File Format | |
| Digital Format: | PDF (commonly available for this era of manual) |
| Print Quality | |
| Print Quality: | Original print quality (may vary with reproduction) |
| Binding Type | |
| Binding Type: | Staple-bound or perfect bound (for printed versions) |
| Paper Type | |
| Paper Type: | Standard paper (for printed versions) |
| Engine Specifications | |
| Primary Engine | |
| Engine Type: | Air-cooled, four-stroke, boxer-twin engine |
| Bore R80: | 82 mm |
| Stroke R80: | 74.5 mm |
| Displacement R80: | 797.5 cc |
| Bore R90: | 90 mm |
| Stroke R90: | 70.6 mm |
| Displacement R90: | 897.8 cc |
| Bore R100: | 94 mm |
| Stroke R100: | 70.6 mm |
| Displacement R100: | 999.2 cc |
| Performance | |
| Horsepower R80: | 50 hp @ 6200 rpm (approx.) |
| Torque R80: | 57 Nm @ 4800 rpm (approx.) |
| Horsepower R90: | 65 hp @ 7000 rpm (approx.) |
| Torque R90: | 70 Nm @ 5500 rpm (approx.) |
| Horsepower R100: | 65 hp @ 7000 rpm (approx.) |
| Torque R100: | 74 Nm @ 6000 rpm (approx.) |
| Fuel System | |
| Carburetors: | Dual Bing carburetors (e.g., 32/36mm for R80, 40mm for R90/R100) |
| Fuel Type: | Unleaded gasoline (87 octane or higher recommended for modern fuels) |
| Transmission | |
| Standard | |
| Gearbox: | 5-speed constant mesh, sequential manual |
| Clutch: | Single dry plate, diaphragm spring |
| Features | |
| Drive Type: | Shaft drive (universal joint and bevel gear final drive) |
| Gear Ratios: | Specific ratios detailed within the manual (vary by model/year) |
| Transmission Fluid Spec: | SAE 90 hypoid gear oil (or equivalent GL-4 spec) |
| Dimensions | |
| Exterior | |
| Wheelbase Approx: | 1460-1500 mm (model dependent) |
| Weights | |
| Dry Weight Approx: | 200-230 kg (model dependent) |
| Safety Features | |
| Ratings | |
| Safety Standards: | Pre-modern motorcycle safety standards; manual focuses on mechanical integrity and safe operation. |
| Active Features | |
| Braking System: | Front hydraulic disc brake, rear drum brake. |
| Passive Features | |
| Frame Construction: | Steel tube frame providing robust structural integrity. |
| Technology Features | |
| Infotainment | |
| Infotainment System: | N/A (Analog instrumentation typical for the era) |
| Driver Assistance | |
| Driver Assistance: | N/A |
| Connectivity | |
| Connectivity Features: | N/A |
| Engine Management | |
| Ignition System: | Breaker points ignition system (may have been upgraded to electronic ignition in some units). |
| Maintenance | |
| Service Intervals | |
| Oil Change Interval: | Every 3,000-5,000 miles (approx., check manual for specific guidance) |
| Valve Adjustment Interval: | Every 6,000-10,000 miles (approx., check manual for specific guidance) |
| Spark Plug Replacement: | Every 6,000-12,000 miles (approx., check manual for specific guidance) |
| Fluid Specifications | |
| Engine Oil Spec: | SAE 20W-50 or SAE 10W-40 motorcycle-specific oil (check manual for temperature recommendations) |
| Brake Fluid Spec: | DOT 3 or DOT 4 hydraulic brake fluid |
| Final Drive Fluid Spec: | SAE 90 hypoid gear oil (GL-4) |
| Known Issues | |
| Common Issues: | Carburetor synchronization drift, ignition coil failure, worn output shaft seal, clutch pushrod seal leaks, starter motor brushes, steering head bearing adjustment. |
| Preventative Maintenance: | Regular valve adjustments, proper carburetor tuning, keeping electrical connections clean, regular inspection of seals. |
| Vehicle History | |
| Brand Heritage | |
| Heritage: | BMW Motorrad, a legacy of engineering excellence and innovation in motorcycle design since 1923. |
| Model Evolution | |
| Airhead Evolution: | The 'Airhead' boxer twin platform formed the backbone of BMW's motorcycle range for decades, evolving from the R50/5, R75/5 through to the later R100 models. The 1979 models represent a mature iteration of this design. |
| Production | |
| Production Era: | These models were produced through the 1970s and into the 1980s, with continuous updates. |
| Awards & Recognition | |
| Recognitions | |
| Industry Recognition: | Iconic status in the motorcycle community for reliability, touring capability, and unique engineering. |
| Ratings | |
| User Ratings: | Highly regarded by owners for their durability and rider comfort. |