Model:
R Series (R80, R90, R100)
Engine Family Codes:
R80/7, R90/6, R100/7, R100GS, R100R, R100RS, R100RT, R100S (covering variations applicable to 1994 production or earlier models still in service)
Target Audience:
BMW R-series 'Airhead' owners, independent mechanics, motorcycle restoration enthusiasts.
Value Proposition:
Provides essential technical information for DIY maintenance and repair, reducing reliance on specialized BMW dealerships.
Documentation Type:
Authoritative guide, typically mirroring factory service manual content.
Diagrams And Illustrations:
Expected to contain detailed diagrams, exploded views, and service illustrations.
Primary Coverage:
Service, Repair, and Workshop Procedures for BMW R80, R90, and R100 Airhead models.
Estimated Page Count:
Likely 300-500+ pages (typical for comprehensive workshop manuals of this era)
Type:
Service and Repair Workshop Manual
Format:
Digital (likely PDF, based on common product offerings)
Engine:
Complete engine overhaul, tuning, carburetor systems (Bing), ignition systems (points/electronic), lubrication, cooling (air-cooled), exhaust systems.
Transmission:
Gearbox servicing, clutch replacement, drive shaft maintenance, final drive assembly and repair.
Electrical:
Wiring diagrams, starter motor, alternator, battery, lighting systems, instrument panel, ignition switch, fuses, relays.
Chassis And Suspension:
Front forks (including possibly dual-chamber or monolever), rear suspension (swingarm, shocks), steering head bearings, wheel bearings, frame inspection.
Brakes:
Drum and disc brake systems (including BMW's early disc brake setups), brake fluid replacement, caliper service, master cylinder rebuild.
Fuel System:
Fuel tank maintenance, fuel lines, fuel pump (if applicable), carburetor synchronization and overhaul.
Bodywork And Trim:
Fairings, fuel tank, seat, fenders, fenders, instrument cluster mounting, minor body panel adjustments.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug service, valve adjustments, fluid level checks, lubrication points.
Troubleshooting:
Diagnostic charts, common problems and solutions, electrical system fault finding, engine performance issues.
Repair:
Engine rebuilds, transmission repairs, suspension overhauls, brake system repairs, electrical component replacement.
Technical Data And Specifications:
Torque specifications, clearances, fluid capacities, electrical resistance values, part identification.
Depth:
Comprehensive (covers routine maintenance to full engine and gearbox rebuilds)
Configuration:
Air-cooled, two-cylinder, four-stroke boxer engine.
Displacement Range:
797cc (R80), 897cc (R90), 980cc/1000cc (R100 variants).
Bore X Stroke:
Varies by model (e.g., R100RS: 94mm x 70.6mm; R80: 85mm x 70.6mm)
Compression Ratio:
Varies by model (e.g., R100GS typically 8.5:1, R100RS/RT typically 9.5:1)
Horsepower Range:
Approximately 50-65 HP depending on specific R model variant.
Torque Range:
Approximately 55-70 Nm depending on specific R model variant.
Carburetion:
Dual Bing carburetors (e.g., Bing 32/40mm, Bing 40mm)
Fuel Type:
Unleaded gasoline (higher octane recommended for optimal performance)
Type:
Breaker point ignition (earlier models) or electronic ignition (later models like those around 1994, e.g., Boyer-Bransden or OEM electronic)
Type:
Wet sump (some early R models) or semi-dry sump with oil cooler (common on R100 models).
Type:
5-speed manual constant mesh gearbox.
Options:
N/A (standard 5-speed gearbox across these models)
Drive System:
Shaft drive (Cardan shaft).
Clutch:
Single dry plate clutch, hydraulically operated.
Crash Test Data:
N/A (Motorcycle, not typically subject to automotive crash testing standards)
Braking System:
Front and rear disc brakes (dual discs on some R100 models). ABS was not standard or widely available on these older airheads.
Lighting:
Halogen headlamp, taillight, brake light, turn signals.
Features:
Basic analog instrumentation (speedometer, tachometer, fuel gauge, warning lights). No modern infotainment systems.
Features:
N/A (Motorcycle, no driver assistance systems).
Features:
N/A (Motorcycle, no connectivity features).
Oil Change:
Typically every 5,000-7,500 km or annually.
Valve Adjustment:
Every 10,000-15,000 km, or as specified in the manual.
Spark Plug Replacement:
Every 10,000-15,000 km, or as per manual recommendation.
Engine Oil:
SAE 20W-50 or SAE 15W-40 (API SG or higher) is common. Specific BMW recommendations should be consulted.
Transmission Oil:
Hypoid gear oil SAE 80W/90 (API GL-5).
Final Drive Oil:
Hypoid gear oil SAE 80W/90 (API GL-5).
Brake Fluid:
DOT 3 or DOT 4 (check specific model requirements).
Common Wear Items:
Clutch wear, output shaft splines, final drive splines, swingarm bearings, steering head bearings, output shaft seal leaks.
Electrical Quirks:
Aging wiring insulation, ignition coil failure, rectifier/regulator issues.
Engine Considerations:
Carburetor tuning and synchronization, potential for pushrod seal leaks.
Bmw Motorrad Legacy:
BMW Motorrad has a long and storied history, with the R-series boxer engine being its defining characteristic since the 1920s. The 'Airhead' era represents a significant and beloved period in BMW motorcycle development.
Airhead Development:
The R80, R90, and R100 series evolved from earlier models like the R75/5, R90S, and R100/7. They were characterized by their robust air-cooled boxer engines, shaft drive, and modular design, making them touring and long-distance specialists.
Production Period:
The R80, R90, and R100 models were produced across various iterations from the 1970s through the late 1990s. The '1994' designation in the manual likely indicates coverage for models manufactured around that time, or as a general service manual for a broad range of these popular airheads.
