Target Audience:
Professional motorcycle technicians, experienced DIY enthusiasts, and owners seeking in-depth knowledge of their BMW R100.
Value Proposition:
Provides essential, often hard-to-find, technical data and procedures for maintaining and repairing a classic BMW motorcycle, crucial for preserving its value and performance.
Manual Benefits:
Enables accurate diagnosis, efficient repair, proper maintenance, and safe operation of the BMW R100.
Primary Coverage:
Comprehensive repair and service for BMW R100 series motorcycles manufactured in 1990.
Secondary Coverage:
Includes troubleshooting, diagnostics, maintenance, adjustments, and disassembly/reassembly procedures.
Estimated Page Count:
300-400 pages (estimated for a comprehensive manual of this type)
Manual Type:
Repair Service Manual
Format:
PDF (Downloadable)
Engine Systems:
Engine overhaul, cylinder head, valve train, piston, connecting rods, crankshaft, oil pump, lubrication system, cooling system (air-cooled design), fuel injection/carburetion.
Transmission Systems:
Gearbox inspection, repair, clutch assembly, drive shaft, final drive.
Electrical Systems:
Ignition system, charging system (alternator, regulator), lighting, starter motor, battery, wiring diagrams, control units.
Chassis And Suspension:
Front fork (including specific variants like Monolever for GS), rear suspension (Monolever), wheel bearings, steering head bearings, frame inspection.
Braking Systems:
Front and rear brake systems (disc brakes), brake fluid replacement, caliper service, master cylinder.
Fuel And Exhaust:
Fuel tank, fuel lines, fuel pump (if applicable), exhaust system maintenance and repair.
Bodywork And Trim:
Fairings, seat, fuel tank mounting, fenders, mirrors, control levers.
Maintenance Procedures:
Oil and filter changes, spark plug replacement, air filter cleaning/replacement, valve clearance adjustment, brake bleeding, tire pressure checks, drive shaft lubrication.
Troubleshooting Diagnostics:
Step-by-step diagnostic flowcharts for common problems (e.g., starting issues, poor running, electrical faults).
Repair Procedures:
Detailed instructions for component replacement and overhaul, including torque specifications for critical fasteners.
Assembly Disassembly:
Complete breakdown and reassembly guides for major components and the entire motorcycle.
Depth Level:
Advanced, suitable for professional technicians and experienced DIY mechanics.
Diagnostic Capability:
Covers diagnostic procedures for both mechanical and electrical systems, often referencing specific test equipment or methods.
Rebuild Guidelines:
Includes specifications and procedures for complete engine and transmission rebuilds.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder boxer engine.
Bore X Stroke:
98 mm x 70.5 mm (for most R100 variants)
Displacement:
980 cc (980 cm³)
Compression Ratio:
Typically 8.5:1 or 9.5:1 depending on specific model and tune.
Horsepower:
Approx. 65-70 HP at 7250 rpm (varies by model, e.g., R100GS, R100RT).
Torque:
Approx. 75-78 Nm (55-58 lb-ft) at 5500 rpm (varies by model).
Fuel Delivery:
Dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model) or Bosch LE-Jetronic fuel injection (on later models like R100RT).
Fuel Type:
Unleaded gasoline, minimum 91 octane (RON+MON)/2.
Oil Type:
SAE 20W-50 or SAE 10W-40, API SF/SG classification (refer to specific manual recommendations).
Gearbox Type:
5-speed manual constant-mesh transmission.
Clutch Type:
Single dry plate clutch, operated hydraulically.
Drive System:
Shaft drive to the rear wheel.
Gear Ratios:
Specific ratios vary by model, detailed in the manual (e.g., 1st gear, final drive ratio).
Transmission Oil:
Gearbox oil specification (e.g., SAE 75W-90 GL-5) and capacity as per manual.
Wheelbase:
Approximately 1430 mm (56.3 in) for R100RS/RT, longer for R100GS.
Dry Weight:
Approx. 220-240 kg (485-529 lbs) depending on model (R100GS typically heavier).
Gross Vehicle Weight Rating:
Refer to owner's manual or specific model documentation.
Crash Test Results:
N/A (Motorcycle safety ratings are not standardized in the same way as cars).
Braking System:
Hydraulically operated disc brakes front and rear (e.g., Brembo).
Suspension Features:
Anti-dive mechanisms or adjustable damping (on some models) contribute to stable handling.
Frame Construction:
Robust steel tube frame provides structural integrity.
Oil Change Interval:
Every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually, whichever comes first (refer to manual).
Valve Adjustment Interval:
Every 10,000 - 20,000 km (6,000 - 12,000 miles) or as indicated by performance.
Gearbox Oil Change:
Every 20,000 - 40,000 km (12,000 - 24,000 miles).
Brake Fluid:
DOT 3 or DOT 4 brake fluid (check manual for specific DOT rating).
Final Drive Oil:
Hypoid gear oil, SAE 90 (GL-5), capacity approx. 200-250 ml.
Common Wear Items:
Clutch wear, exhaust header pipe corrosion, output shaft seal leaks, swingarm pivot bearings, headstock bearings, front fork seal leaks.
Electrical Faults:
Degradation of wiring loom insulation, alternator brushes, regulator failures.
Engine Considerations:
Carbon buildup in combustion chambers, camshaft wear (on high-mileage units), potential for oil consumption.
Bmw Motorcycle History:
BMW has a long-standing reputation for producing durable, high-quality motorcycles with innovative engineering, particularly with their boxer-twin engines.
R100 Lineage:
The R100 series represents the evolution of BMW's boxer-twin platform, building upon the R90 and R100/7 series, offering improved performance and technology.
R100Gs Introduction:
The R100GS, introduced in 1987, significantly expanded the R100 line into the adventure touring segment with its long-travel suspension and robust build.
Production Period:
The R100 series was produced from the late 1970s through the mid-1990s.
Manufacturing Location:
Berlin, Germany (BMW Motorrad plant).
Brand Reputation:
BMW Motorrad is consistently recognized for engineering excellence, build quality, and rider comfort, particularly in the touring and adventure segments.
Owner Satisfaction:
Owners of the R100 series often praise its reliability, durability, and character, though maintenance can be more involved than modern bikes.
Historical Significance:
The R100 series is considered a landmark in motorcycle engineering, representing the pinnacle of BMW's air-cooled boxer-twin development before the introduction of the oil-cooled K-series and subsequent liquid-cooled boxer engines.
