Target Audience:
BMW airhead motorcycle owners and independent workshops specializing in vintage BMW motorcycles.
Value Proposition:
Provides essential technical data, troubleshooting, and repair procedures for a significant period of BMW's air-cooled motorcycle production, enabling owners to maintain and repair their classic machines.
Vintage Coverage:
Specifically covers the highly regarded R80, R90, and R100 series, which are iconic in BMW motorcycle history.
Completeness:
Promises 'complete' coverage, implying all essential aspects of maintenance and repair are included.
Manual Coverage:
Complete Workshop Service Repair
Diagnostic Flowcharts:
Likely includes step-by-step diagnostic flowcharts for common problems.
Technical Bulletins:
May include reference to or summary of factory technical service bulletins relevant to these models.
Estimated Page Count:
Refer to specific edition/format for exact count, typically 500+ pages for comprehensive coverage
Manual Type:
Service and Repair Manual
Language:
English (Assumed based on common availability for this market)
Format:
Downloadable Digital Format (PDF)
Engine Overhaul:
Detailed procedures for disassembly, inspection, repair, and reassembly of Boxer twin-cylinder engines (R80, R90, R100 variants).
Fuel System Service:
Carburetor tuning, maintenance, and repair (Dell'Orto, Bing), fuel pump, fuel lines, and tank.
Ignition System:
Ignition timing, coil testing, spark plug specifications, CDI unit diagnostics.
Transmission And Drivetrain:
Gearbox inspection, maintenance, repair, clutch service, driveshaft and final drive maintenance.
Suspension And Steering:
Fork disassembly, seal replacement, damper servicing, rear shock absorber adjustments and replacement, steering head bearing maintenance.
Braking System:
Brake caliper overhaul, pad replacement, fluid bleeding, master cylinder servicing, disc and drum brake maintenance.
Electrical System:
Wiring diagrams, starter motor, alternator, battery maintenance, lighting system, switches, and instrumentation troubleshooting.
Bodywork And Chassis:
Frame inspection, body panel removal and installation, seat, fairing (if applicable), and luggage system maintenance.
Cooling System:
Although air-cooled, the manual covers oil cooling systems (if applicable to specific variants) and related components.
Exhaust System:
Maintenance and repair of exhaust headers, mufflers, and associated fittings.
Wheels And Tires:
Information on wheel bearing maintenance, spoke wheel truing, and tire size recommendations.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, chain adjustment, brake fluid checks.
Troubleshooting Guides:
Diagnostic charts and procedures for common problems and failures.
Engine Rebuilds:
Complete engine disassembly, component inspection (pistons, cylinders, valves, crankshaft), and reassembly with torque specifications.
Carburetor Recalibration:
Step-by-step instructions for synchronizing, jetting, and rebuilding carburetors for optimal performance.
Electrical Diagnostics:
Testing of charging system, ignition components, starter motor, and auxiliary circuits using multimeters and specified procedures.
Suspension Overhaul:
Detailed instructions for rebuilding front forks and servicing rear shock absorbers.
Clutch Replacement:
Procedure for clutch disc replacement and inspection of clutch components.
Wheel And Tire Service:
Wheel bearing maintenance, tire mounting and balancing, and spoke tensioning.
Torque Specifications:
Critical torque values for engine, chassis, and electrical components provided for accurate assembly.
Depth Of Coverage:
Comprehensive from basic maintenance to full engine and transmission rebuilds.
Diagnostics Capability:
Includes procedures for diagnosing electrical faults, fuel system issues, and mechanical wear using standard tools and specifications.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder (Boxer)
Bore X Stroke:
Varies by model: R80 (82mm x 74.5mm), R90 (90mm x 70.6mm), R100 (94mm x 70.6mm)
Displacement:
Varies by model: R80 (797cc), R90 (897cc), R100 (979-1000cc)
Compression Ratio:
Varies by model and variant, typically between 8.5:1 and 10.0:1
Valve Train:
Overhead valves (OHV) operated by pushrods and rocker arms.
Lubrication System:
Wet sump lubrication system with oil filter.
Horsepower Range:
Approx. 50-70 HP depending on model and tuning.
Torque Range:
Approx. 55-70 Nm depending on model.
Carburetors:
Typically dual Dell'Orto PHM 38/40 or Bing 32/40 carburetors, depending on model and year.
Fuel Type:
Unleaded gasoline, minimum octane rating as specified by BMW (typically 95 RON or higher).
Oil Change Interval:
Typically every 5,000 - 10,000 km or annually, depending on usage. Check manual for exact specification.
Valve Clearance Adjustment:
Recommended every 10,000 km. Specific clearances provided in manual.
Engine Oil:
Typically SAE 20W-50 or SAE 10W-40 API SG or higher. Consult manual for precise recommendations.
Brake Fluid:
DOT 3 or DOT 4 brake fluid. Regular replacement advised.
Gearbox Oil:
EP 80 or 85W-90 gear oil.
Final Drive Oil:
EP 80 or 85W-90 gear oil.
Common Wear Items:
Fork seals, clutch wear, gearbox input shaft splines, aging electrical connectors, exhaust system corrosion.
Potential Engine Issues:
Oil leaks from pushrod tubes and seals, particularly with age and mileage. Carburetor synchronization drift.
Bmw Motorcycle Legacy:
BMW has a long-standing reputation for engineering quality, durability, and shaft-driven motorcycles, particularly with their "Airhead" boxer engine platform.
R Series Development:
The R80, R90, and R100 series represent an evolution of BMW's successful airhead motorcycles, building upon earlier models like the R60/7 and R75/7, introducing larger displacements and improved features throughout the 1970s and 1980s.
Production Period:
Models covered were primarily produced between 1978 and 1986. The R100GS, for example, was introduced later in this period.
