Market Segment:
Classic Airhead Boxer Motorcycle
Competitors:
Other contemporary BMW boxer twins, Honda CX series, Moto Guzzi V-twin.
Design Philosophy:
Robust engineering, shaft drive, air-cooled boxer engine, timeless design.
Reliability:
Known for its durability and longevity with proper maintenance.
Benefit To Owner:
Enables DIY maintenance and repair, saving costs and ensuring quality workmanship.
Engine Mechanical:
Complete overhaul, cylinder head, pistons, crankshaft, camshaft, timing.
Engine Fuel System:
Carburetor (Dell'Orto PHM 40) tuning, fuel lines, fuel pump.
Engine Ignition System:
Points, condenser, ignition timing, coil, spark plugs.
Transmission Gearbox:
Clutch, gearbox internals, shifting mechanism, lubrication.
Final Drive:
Driveshaft, universal joints, final drive unit, lubrication.
Electrical System:
Wiring diagrams, battery, charging system (alternator, rectifier), lighting, starter motor.
Braking System:
Hydraulic brake system, master cylinders, calipers, brake pads, brake fluid.
Suspension Front:
Telescopic forks, oil levels, seals, springs, steering head bearings.
Suspension Rear:
Monolever system, shock absorber, swingarm, universal joint lubrication.
Wheels And Tires:
Wheel balancing, spoke tension, tire types, recommended pressures.
Fuel Tank And Seating:
Fuel tank removal and installation, seat maintenance.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, valve clearance adjustments.
Troubleshooting:
Diagnostic flowcharts for common starting, running, and electrical issues.
Engine Rebuild:
Step-by-step guides for full engine disassembly and reassembly.
Carburetor Rebuild:
Detailed instructions for cleaning and rebuilding Dell'Orto PHM 40 carburetors.
Brake System Maintenance:
Bleeding brakes, replacing pads and fluid, servicing calipers.
Fork Seal Replacement:
Detailed procedure for replacing front fork oil seals.
Electrical Component Testing:
Testing alternator output, starter motor function, ignition components.
Depth:
Comprehensive: Covers routine maintenance, diagnostics, adjustments, and complete overhauls.
Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder
Bore X Stroke:
90 mm x 76.4 mm
Horsepower:
Approx. 65 hp @ 6200 rpm
Torque:
Approx. 77 Nm (57 lb-ft) @ 4800 rpm
Carburetors:
2 x Dell'Orto PHM 40 CD (or Bing 32/36mm, depending on exact sub-model/market)
Fuel Type:
Unleaded gasoline (premium recommended)
Oil Type:
SAE 20W-50 or 10W-40 motorcycle-specific oil
Oil Capacity:
Approx. 2.7 liters (2.9 US qt) with filter change
Safety Certifications:
Standard motorcycle safety compliance for the era.
Brakes:
Dual disc front brakes, single disc rear brakes (hydraulic).
Lighting:
Halogen headlight, taillight, turn signals.
Frame:
Steel tube frame for rigidity and stability.
Windscreen:
Optional or standard depending on specific R100 model variant (e.g., R100RT).
Oil Change Interval:
Every 3,000 - 5,000 km (1,800 - 3,000 miles) or annually.
Valve Adjustment Interval:
Every 6,000 - 10,000 km (3,700 - 6,200 miles).
Spark Plug Check:
Every 3,000 - 5,000 km (1,800 - 3,000 miles).
Carburetor Sync:
As needed, or during major service intervals.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Fork Oil Type:
SAE 15W or 20W fork oil (specific weight may vary by owner preference/manual).
Common Wear Items:
Fork seals, clutch plates, exhaust gaskets, steering head bearings, clutch cable.
Potential Electrical:
Aging wiring insulation, rectifier failures, charging system issues.
Air Filter Part Number:
Refer to manual for exact part number based on specific R100 variant.
Oil Filter Part Number:
Refer to manual for exact part number (e.g., Mann MW 50/1 or equivalent).
Spark Plug Part Number:
Bosch W 8 AC or NGK B7ES (check manual for exact fitment).
Brand Legacy:
BMW Motorrad, renowned for engineering, quality, and touring motorcycles.
Predecessor:
R75/7, R80/7, R90/6, R100/7.
Successor:
Further iterations of the R100 series (e.g., R100GS, R100RS, R100RT).
Production Period:
1977-1984 (R100 series in general)
Manufacturing Location:
Berlin, Germany (BMW Motorrad Plant)
