Target Audience:
DIY mechanics, home mechanics, independent repair shops, and BMW motorcycle enthusiasts seeking to maintain or repair their R100.
Value Proposition:
Provides essential technical data and step-by-step procedures to empower owners and reduce reliance on expensive dealership services.
Benefit:
Enables owners to perform repairs and maintenance with confidence, ensuring optimal performance and longevity of their classic BMW motorcycle.
Usability:
Clear instructions, detailed diagrams, and specifications are presented in a logical, easy-to-follow format.
Engine Mechanical:
Engine disassembly, assembly, inspection, repair procedures for cylinders, pistons, crankshaft, camshaft, valve train, timing.
Fuel System:
Carburetor overhaul (Bing CV), fuel pump, fuel lines, fuel tank maintenance, fuel filter replacement.
Ignition System:
Ignition timing, spark plugs, ignition coils, electronic ignition components (if applicable), troubleshooting.
Transmission Drivetrain:
Gearbox disassembly, assembly, inspection, lubrication, clutch operation and adjustment, final drive and driveshaft maintenance.
Brakes:
Brake system diagnosis, overhaul of hydraulic components (master cylinders, calipers, wheel cylinders), brake pad/shoe replacement, bleeding procedures, parking brake.
Electrical System:
Wiring diagrams, charging system (alternator, voltage regulator), starter motor, lighting, instrumentation, battery maintenance, fuse replacement.
Suspension Steering:
Front forks (including W, W-2, PD forks), rear shock absorbers, swingarm, steering head bearings, wheel bearings, wheel balancing.
Bodywork Frame:
Frame inspection, body panel removal and installation, fairings (if equipped), seat maintenance, luggage systems.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, air filter cleaning/replacement, chain adjustment, brake adjustments.
Troubleshooting:
Diagnosis of common performance issues, electrical faults, starting problems, braking anomalies.
Rebuild Procedures:
Detailed steps for engine overhaul, gearbox rebuilding, carburetor rebuilding, fork seal replacement.
Adjustment Procedures:
Valve clearance adjustment, carburetor synchronization, clutch cable adjustment, brake lever free play.
Depth:
Comprehensive; covers from basic routine maintenance to complete engine and transmission rebuilds, including diagnostic procedures.
Engine Type:
Air-cooled, four-stroke, boxer twin-cylinder
Displacement:
979 cc (common across most R100 variants)
Bore X Stroke:
94 mm x 70.7 mm
Compression Ratio:
8.5:1 or 9.5:1 (depending on specific model variant and piston type)
Horsepower Typical:
Approx. 65-70 HP @ 7250 RPM (varies by model)
Torque Typical:
Approx. 75 Nm (55 lb-ft) @ 6000 RPM (varies by model)
Carburetors:
Dual Bing 32mm constant velocity (CV) carburetors (e.g., Bing 32/32/301 or similar)
Fuel Type:
Unleaded Gasoline (Premium recommended)
Fuel Capacity:
Typically 18-21 Liters (4.75-5.5 US Gallons)
Type:
5-speed, constant mesh, sequential gearbox
Clutch:
Single dry plate, diaphragm spring clutch
Final Drive:
Shaft drive to rear wheel via enclosed driveshaft
Reverse Gear:
Available on specific touring models (e.g., R100TIC) with electric or manual actuator.
Lubrication:
Gearbox oil (e.g., SAE 80W/90 GL-4 or GL-5)
Length:
Varies by model (e.g., approx. 2200-2300 mm)
Width:
Varies by model (e.g., approx. 750-950 mm including handlebars/fairing)
Height:
Varies by model (e.g., approx. 1200-1350 mm)
Dry Weight:
Approx. 190-225 kg (419-496 lbs), depending on model and equipment
Gross Vehicle Weight Rating:
Typically around 400 kg (880 lbs)
Crash Test Data:
N/A (Motorcycle; crash testing methodologies differ from automobiles)
Braking System:
Dual disc front brakes (typically 260-280mm discs with twin-piston calipers), single disc rear brake (typically 260-280mm disc).
Lighting:
Halogen headlamp, taillight, brake light, turn signals.
Chassis Design:
Robust steel tube frame contributing to stability and rider protection.
Oil Change:
Every 5,000 - 7,500 km (3,000 - 5,000 miles) or annually, whichever comes first.
Valve Adjustment:
Every 10,000 - 12,000 km (6,000 - 7,500 miles).
Carburetor Sync:
Every 10,000 - 12,000 km (6,000 - 7,500 miles) or as needed for smooth running.
Engine Oil:
SAE 20W-50 or 10W-40 motorcycle specific oil (API SG or higher).
Gearbox Oil:
SAE 80W/90 GL-4 or GL-5 gear oil.
Final Drive Oil:
SAE 80W/90 GL-5 gear oil.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid.
Common Problems:
Wear on valve guides, timing chain tensioner wear, clutch wear, electrical connector corrosion, carburetors requiring tuning/rebuilding, fork seal leaks.
Preventative Measures:
Regular maintenance as per manual, using correct fluids, keeping electrical connections clean and protected, periodic inspection of wear items.
Bmw Motorcycle Legacy:
BMW has a long and distinguished history in motorcycle manufacturing, dating back to the 1920s, with a reputation for robust engineering, reliability, and advanced technology.
R100 Lineage:
The R100 series is an evolution of BMW's highly successful airhead boxer twins, building upon the R75/5, R90/6, and R100/7 series, offering increased displacement and refinement.
Production Era:
The R100 models were produced from the late 1970s through the early 1990s, with 1981 being a key year in its development, featuring various sub-models.
Manufacturing Location:
Berlin, Germany (Spandau plant)
