Chassis Codes:
R80/7, R80G/S, R80ST, R90/6, R90S, R100/7, R100S, R100RS, R100RT, R100CS, R100GS, R100R, R100RT (Monolever), R100RS (Monolever)
Target Audience:
Owners and mechanics specializing in BMW airhead motorcycles (R80, R90, R100 series).
Value Proposition:
Provides the definitive, official factory documentation for comprehensive maintenance, repair, and troubleshooting, superior to aftermarket or generic guides.
Completeness:
Complete official factory data, offering unmatched detail for all aspects of the motorcycle's systems.
Printability:
Option to print specific pages or the entire manual for workshop use.
Powertrain:
Engine overhaul, cylinder head, piston, crankshaft, camshaft, valve train, lubrication system, cooling system (air-cooled), fuel system (carburetors, fuel pumps), exhaust system.
Drivetrain:
Clutch (single plate dry, dual plate dry), transmission (gearbox overhaul, shift mechanisms, ratios), final drive (bevel gear, driveshaft).
Chassis Suspension:
Frame, front fork (telescopic, leading link), rear suspension (swingarm, monolever), shock absorbers, steering.
Brakes:
Front and rear brake systems (drum, disc), hydraulic components, bleeding procedures, pad/shoe replacement.
Electrical:
Ignition system (points, electronic), charging system (alternator, regulator), starting system (starter motor, battery), lighting system, instrumentation, wiring diagrams, troubleshooting.
Bodywork:
Body panels, fuel tank, seat, fairings (if applicable), fenders, stands, exhaust system mounting.
Maintenance:
Routine service, oil changes, filter replacements, spark plug service, brake adjustments, lubrication, cable adjustments, valve clearance checks.
Repair:
Engine rebuilds, transmission overhauls, suspension component replacement, brake caliper/master cylinder repair, electrical component testing and replacement.
Troubleshooting:
Diagnostic procedures for common issues, fault finding charts, electrical system diagnostics.
Depth:
Comprehensive factory-level detail, suitable for professional mechanics and experienced DIY enthusiasts. Includes step-by-step instructions, torque specifications, special tool requirements, and diagnostic information.
Readability:
High-resolution scans of original factory documents, ensuring clear text and legible diagrams.
Binding:
N/A (Digital Download PDF)
Paper:
N/A (Digital Download PDF)
Text Search:
Likely searchable text, enabling quick location of specific information within the PDF.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder boxer engine.
Displacement R80:
797.5 cc
Displacement R90:
897.7 cc
Displacement R100:
979.7 cc to 1047.7 cc (depending on specific R100 variant)
Bore Stroke R80:
82.5 mm x 75 mm
Bore Stroke R90:
90 mm x 70.6 mm
Bore Stroke R100:
94 mm x 74 mm (R100GS/R/RT/RS), 94mm x 78mm (R100/7)
Horsepower R80:
Approx. 50-55 hp @ 6500 rpm
Horsepower R90S:
Approx. 65 hp @ 7000 rpm
Horsepower R100:
Approx. 60-70 hp @ 7000 rpm (variant dependent)
Torque R80:
Approx. 56-60 Nm @ 5000 rpm
Torque R90S:
Approx. 75 Nm @ 5500 rpm
Torque R100:
Approx. 65-75 Nm @ 5500 rpm (variant dependent)
Carburetion:
Dual Bing constant-velocity carburetors (e.g., 32mm, 40mm depending on model).
Fuel Type:
Unleaded gasoline (minimum 91 RON recommended for later models).
Fuel Capacity:
Typically 24 liters (e.g., R100RT, R100RS) to 26 liters.
Type:
5-speed constant mesh gearbox, shaft final drive.
Gear Ratios:
Specific gear ratios vary by model and year; manual details these extensively.
Clutch:
Single plate dry clutch (most models) or Dual plate dry clutch (some R100 variants).
Final Drive:
Shaft drive with enclosed universal joint and bevel gear.
Crash Test Data:
Not applicable for motorcycles of this era in modern terms.
Braking System:
Combination of disc brakes (front, often dual) and drum or disc brakes (rear), depending on the specific model and year. ABS was not a common feature on these models.
Lighting:
Halogen headlight, tail light, brake light, turn signals.
Oil Change:
Typically every 5,000-10,000 km or annually, whichever comes first. Manual will specify exact intervals and oil type.
Valve Adjustment:
Typically every 10,000-20,000 km. Manual provides detailed procedure and specifications.
Engine Oil:
Mineral or semi-synthetic SAE 20W-50 or 10W-40 is common. Manual will provide specific BMW recommendations (e.g., BMW Motoröl SAE 20W-50).
Transmission Oil:
Hypoid gear oil, SAE 80W-90 (e.g., BMW Gearoil SAE 80W-90).
Final Drive Oil:
Hypoid gear oil, SAE 80W-90 (e.g., BMW Gearoil SAE 80W-90).
Brake Fluid:
DOT 3 or DOT 4 glycol-based fluid, depending on the original specification. Manual will confirm.
Common Wear Items:
Clutch wear, final drive spline wear, camshaft follower wear, exhaust header leaks, electrical connections (corrosion).
Preventative Maintenance:
Regular lubrication of pivot points, checking and tightening fasteners, monitoring clutch and transmission fluid levels.
Legacy:
BMW Motorrad's long-standing reputation for robust engineering, durability, and rider comfort, particularly with the boxer engine platform.
Development:
The R80, R90, and R100 series represent the evolution of BMW's boxer-twin motorcycles, starting from the '/5' series and progressing through the '/6', '/7', and finally the Monolever era, incorporating advancements in chassis design, engine performance, and braking systems.
Era:
These models were produced across several decades, with the 1991 models representing later iterations of the R100 series (e.g., R100GS, R100R, R100RT Monolever).
