Vehicle Segment:
Sport Touring / Roadster Motorcycle
Target Audience:
BMW R 850 R owners seeking comprehensive DIY maintenance and repair capabilities
Comparison Points:
Direct competitor to other mid-size touring and roadster motorcycles of the era, known for BMW's engineering and boxer engine character.
Motorcycle Strengths:
Torquey boxer-twin engine, shaft drive for low maintenance, comfortable ergonomics, build quality.
Benefit To Owner:
Empowers owners to perform detailed maintenance and repairs, saving time and money, and ensuring the longevity of their vintage BMW motorcycle.
Scope:
Comprehensive service, maintenance, and repair
Documentation Style:
Step-by-step instructions and exploded views
Estimated Pages:
Likely 300-500+ pages (typical for a comprehensive motorcycle service manual of this era)
Type:
Factory Service Manual / Workshop Manual
Primary Language:
English
Digital Format:
PDF (implied by typical modern digital manual offerings)
Engine:
Complete engine disassembly, assembly, tuning, and troubleshooting
Fuel System:
Fuel injection system (Bosch Motronic), fuel pump, injectors, sensors, throttle body
Ignition System:
Ignition coils, spark plugs, ECU control, timing
Transmission Clutch:
Clutch operation, gearbox, final drive (shaft drive)
Brakes:
Brake system (ABS optional), caliper maintenance, master cylinder, fluid replacement
Suspension:
Front telescopic forks, rear monoshock suspension, adjustments
Electrical System:
Wiring diagrams, battery, charging system (alternator, regulator), lighting, starter motor
Chassis Frame:
Frame integrity, steering head bearings, swingarm
Bodywork Fittings:
Fairings, seat, fuel tank, instrumentation, controls
Maintenance:
Routine checks, oil changes, filter replacements, brake bleeding, fluid changes
Troubleshooting:
Diagnostic procedures for common and uncommon faults
Repair:
Detailed instructions for component repair and replacement
Overhaul:
Complete engine and gearbox rebuild procedures
Adjustment:
Valve clearance adjustment, throttle cable adjustment, suspension settings
Diagnostics:
Advanced diagnostic procedures, including potential use of diagnostic tools (BMW specific if applicable)
Specifications:
Torque values, tolerances, clearances, fluid capacities, electrical specifications
Wiring Diagrams:
Detailed electrical schematics for all systems
Illustrations:
Exploded views and diagrams for component identification and assembly
Searchable Text:
Typically searchable text within PDF for efficient information retrieval
Quality:
High-resolution scans or native digital format ensuring clarity of text and images
Physical Format:
Not applicable (assuming digital PDF product)
Physical Format:
Not applicable (assuming digital PDF product)
Configuration:
Air-cooled, four-stroke, flat-twin (boxer)
Displacement:
848 cc (51.7 cu in)
Bore X Stroke:
90.0 mm x 66.0 mm (3.54 in x 2.60 in)
Compression Ratio:
10.0:1
Valve Train:
2 valves per cylinder, pushrod actuated overhead valves
Horsepower:
Approx. 70 hp (52 kW) @ 7000 rpm
Torque:
Approx. 79 Nm (58 lb-ft) @ 5000 rpm
Fuel Delivery:
Bosch Motronic 2.2 fuel injection
Fuel Type:
Unleaded gasoline, minimum 91 octane (RON+MON)/2
Length:
Approx. 2,200 mm (86.6 in)
Width:
Approx. 850 mm (33.5 in) (across handlebars)
Height:
Approx. 1,230 mm (48.4 in) (to top of windscreen)
Dry Weight:
Approx. 211 kg (465 lbs)
Gross Vehicle Weight Rating:
Approx. 450 kg (992 lbs)
Fuel Tank Capacity:
21 liters (5.5 US gal)
ABS:
Optional ABS (Anti-lock Braking System) available on some models
Braking System:
Dual front disc brakes, single rear disc brake. Calipers likely Brembo or equivalent.
Lighting:
Halogen headlight, LED taillight (standard/common for era)
Frame Construction:
Steel trellis frame providing rigidity and stability
Instrumentation:
Analog tachometer, speedometer, fuel gauge, warning lights, clock.
ABS:
Optional ABS, providing enhanced braking safety.
Nil:
No modern electronic rider aids or connectivity features typical of later models.
Oil Change Interval:
Typically every 10,000 km (6,000 miles) or annually, whichever comes first.
Valve Clearance Check:
Recommended every 20,000 km (12,000 miles) or as per manual specifications.
Spark Plug Replacement:
Typically every 10,000-20,000 km (6,000-12,000 miles), depending on type and usage.
Brake Fluid Flush:
Recommended every 2 years.
Engine Oil:
BMW recommends a synthetic 20W-50 or 15W-50 API SG/SH or JASO MA motorcycle oil. Check manual for exact BMW specific part numbers.
Brake Fluid:
DOT 4 brake fluid.
Engine Oil Capacity:
Approx. 3.0 liters (3.2 US qt) with filter change.
Common Wear Items:
Clutch plates, clutch slave cylinder seals, swingarm bearings, exhaust header gaskets, fuel pump module.
Electrical:
Corrosion on connectors, starter relay issues, aging wiring loom insulation.
Fuel System:
Injector clogging, fuel pressure regulator issues, fuel filter replacement is critical.
Market Reputation:
Praised for its robust engineering, comfortable ride, and reliability, often considered a 'gentleman's express'.
Longevity:
Many R 850 R models are still on the road with high mileage, testament to their build quality and the availability of comprehensive service information.
