Historical Significance:
The BMW R100 series, particularly the 1984 models, represents the zenith of BMW's air-cooled boxer twin motorcycle development, blending touring comfort (RT), sporty performance (RS), and rugged versatility (GS).
Segment Competitors:
Competed against other large-displacement European and Japanese motorcycles of the era, such as Moto Guzzi, Honda Gold Wing variants, and certain Kawasaki/Suzuki models, often positioning itself as a premium, technically advanced option.
Engine Design:
Reliable air-cooled, horizontally opposed twin-cylinder boxer engine.
Drivetrain:
Shaft drive, renowned for low maintenance and reliability.
Handling:
Excellent handling characteristics for its size, due to the low center of gravity of the boxer engine.
Build Quality:
Legendary BMW build quality and durability.
Manual Type:
Service and Repair Manual
Format:
Downloadable Digital File (PDF)
Coverage Scope:
All variants of the 1984 BMW R100
Applicable Models:
BMW R100, R100RT, R100RS, R100CS (and potentially closely related variants from 1984).
Estimated Page Count:
300-400 Pages (typical for comprehensive manual)
Engine:
Full engine disassembly, assembly, tuning, diagnostics, and component specifications (including R100, R100S, R100RT, R100CS variants).
Transmission:
Gearbox (5-speed), clutch, final drive maintenance and repair.
Fuel System:
Carburetor systems (e.g., Bing 32/40), fuel tanks, fuel lines, fuel pump troubleshooting.
Electrical System:
Ignition system, lighting, charging system (alternator, regulator), starter motor, battery, wiring diagrams.
Brakes:
Front and rear brake systems (disc brakes), hydraulic components, bleeding procedures.
Suspension:
Front forks (telescopic), rear swingarm, shock absorbers, linkage maintenance and adjustment.
Chassis And Bodywork:
Frame, fairings (RT/RS models), seat, handlebars, fenders, body panel removal and installation.
Wheel And Tire:
Wheel bearing maintenance, tire replacement, wheel balance.
Frame And Steering:
Steering head bearing maintenance, fork seal replacement, frame inspection.
Routine Maintenance:
Oil changes, filter replacement, spark plug servicing, valve adjustment, chain adjustment (if applicable), lubrication points.
Troubleshooting:
Diagnostic flowcharts and procedures for common issues across all major systems.
Component Overhaul:
Detailed step-by-step instructions for rebuilding key components like engines, transmissions, and brake calipers.
Electrical Diagnostics:
Wiring diagrams, testing procedures for electrical components, fault finding.
Specifications And Data:
Torque values, clearances, fluid capacities, part numbers, electrical resistance values.
Assembly Disassembly:
Complete disassembly and reassembly procedures for all major motorcycle components.
Adjustment Procedures:
Detailed instructions for adjusting clutch, brakes, carburetors, and suspension settings.
Depth Of Coverage:
Comprehensive (from basic maintenance to full engine rebuilds and advanced electrical diagnostics).
Diagnostic Capability:
Enables owner/mechanic to diagnose and repair most mechanical and electrical faults.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder boxer
Bore X Stroke:
94 mm x 70.6 mm
Compression Ratio:
8.4:1 (typical for R100 models)
Valve Train:
OHV, 2 valves per cylinder, pushrod actuated
Engine Oil Capacity:
2.5 liters (with filter change)
Engine Oil Type:
SAE 20W-50 or 10W-40 motorcycle specific oil
Horsepower:
Approx. 70-75 HP @ 7000-7500 RPM (depending on model variant and tuning)
Torque:
Approx. 55-60 lb-ft @ 5500-6000 RPM (depending on model variant)
Carburetor Type:
Dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model)
Fuel Type:
Unleaded Gasoline, 90-95 RON (Octane Rating)
Wheelbase:
Approx. 1465 mm (57.7 inches) (varies slightly by model)
Seat Height:
Approx. 780-820 mm (30.7-32.3 inches) (varies by model)
Dry Weight:
Approx. 200-230 kg (440-507 lbs) (varies by model)
Fuel Tank Capacity:
24 liters (6.3 US gallons)
Gross Vehicle Weight Rating:
Typically around 400-450 kg (880-990 lbs)
Safety Standard Era:
Designed to meet safety standards of the early 1980s.
Braking System:
Dual front disc brakes, single rear disc brake (typically Brembo or ATE calipers).
Tire Specifications:
Tubed or tubeless tires, commonly 100/90-18 front and 120/90-18 or 130/90-17 rear (specific sizes vary by model).
Lighting:
Halogen headlight, integrated turn signals, brake light.
Oil Change Interval:
Every 5,000 km (3,000 miles) or annually.
Valve Adjustment Interval:
Every 10,000 km (6,000 miles).
Spark Plug Replacement:
Every 10,000 km (6,000 miles).
Brake Fluid Type:
DOT 4 hydraulic fluid.
Coolant Type:
Air-cooled (no coolant required).
Common Wear Items:
Clutch wear, final drive spline wear, carburetor synchronization drift, starter motor brushes, exhaust header leaks.
Electrical Gremlins:
Age-related issues with wiring insulation and electrical connectors can occur; consistent maintenance and inspection are key.
Carburetor Tuning:
Regular carburetor synchronization and jetting checks are critical for optimal performance and fuel economy.
Bmw Motorcycle Legacy:
BMW's reputation for robust engineering and reliable, long-lasting motorcycles, particularly with their iconic boxer twin engine platform, which dates back to the 1920s.
R Series Development:
The R100 series is an evolution of earlier R75, R80, and R90 models, featuring larger displacement and chassis refinements. The 1984 models represent a mature iteration of this platform.
Production Period:
The R100 range was produced from the late 1970s through the early 1990s, with the 1984 model year being a significant point in its development.
