Segment:
Touring, Sport-Touring, Standard, Adventure-Touring motorcycles
Competitors:
Honda ST1100, Yamaha FJ1200, Kawasaki GTR1000, Moto Guzzi California, Ducati ST series
Engine Layout:
Air-cooled, four-stroke boxer-twin engine
Handling:
Known for stable handling and comfortable ride, especially in RT and LT variants
Utility:
Essential for owners and independent mechanics to maintain and repair the R850 series effectively.
Primary Coverage:
Repair, Service, Maintenance, Troubleshooting, Diagnostics
Estimated Pages:
High (Detailed coverage implies hundreds of pages; specific count unavailable from provided data)
Type:
Factory Service Manual / Repair Manual
Language:
English (Likely, based on typical manuals for this market)
Format:
Downloadable Digital File (PDF)
Engine:
Full overhaul, tuning, component replacement (e.g., cylinders, pistons, valves, camshafts, timing chains)
Fuel System:
Fuel injection (EFI), fuel pump, injectors, sensors, throttle body, fuel tank, lines
Ignition System:
ECU, coils, spark plugs, wiring, troubleshooting ignition faults
Transmission Drivetrain:
Gearbox overhaul, clutch service, final drive (shaft drive), gearbox oil specifications
Brakes:
ABS system (if equipped), hydraulic systems, caliper service, brake pad replacement, fluid flush and bleed procedures, master cylinders
Suspension:
Front fork service (oil change, seal replacement), rear shock absorber overhaul/replacement, linkage maintenance
Electrical System:
Wiring diagrams, component testing, battery, charging system (alternator, regulator), lighting, starter system, fuses, relays
Frame Chassis:
Frame inspection, component mounting, bodywork repair and replacement
Cooling System:
Oil cooling system (if applicable), radiator, oil cooler lines, oil viscosity specifications
Routine Maintenance:
Oil and filter changes, air filter replacement, spark plug replacement, drive belt inspection/replacement, valve clearance checks
Troubleshooting:
Diagnostic flowcharts for common and uncommon issues, symptom-based troubleshooting guides
Repair Procedures:
Step-by-step instructions for major component overhauls and replacements
Diagnostic Tools:
Information on using diagnostic equipment and interpreting error codes (if applicable for the era)
Depth:
Comprehensive, covering everything from basic servicing to full engine and gearbox rebuilds, including electrical diagnostics.
Type:
Air-cooled, four-stroke boxer-twin, SOHC, 4 valves per cylinder
Displacement:
848 cc (approximately)
Bore X Stroke:
90.0 mm x 66.0 mm (typical for R850 series)
Compression Ratio:
9.5:1 or 10.0:1 (variant dependent)
Horsepower:
Approx. 70-77 hp (depending on model and year)
Torque:
Approx. 75-78 Nm (depending on model and year)
Fuel Delivery:
Bosch Motronic Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Oil Type:
API SG or higher, SAE 20W-50 or 15W-50 motorcycle specific oil
Oil Capacity:
Approx. 3.0 liters (with filter change)
Type:
5-speed manual gearbox
Options:
N/A (All R850 models featured the 5-speed manual)
Clutch:
Single dry plate clutch, hydraulically actuated
Final Drive:
Shaft drive with single-sided swingarm
Gearbox Oil:
SAE 75W-90 Synthetic Gear Oil (API GL-5)
Gearbox Oil Capacity:
Approx. 0.8 liters
Length:
Varies by model variant (RT/LT generally longer)
Width:
Varies by model variant (RT/LT generally wider due to fairings)
Height:
Varies by model variant
Dry Weight:
Approx. 210-230 kg (depending on model variant)
Wet Weight:
Approx. 230-250 kg (depending on model variant)
Fuel Tank Capacity:
Approx. 20-23 liters (depending on model variant)
Crash Testing:
N/A (Motorcycle safety ratings are not standardized like cars; manual focuses on mechanical integrity)
Braking System:
Optional ABS (Anti-lock Braking System) on most variants, powerful disc brakes front and rear.
Lighting:
Integrated headlight, taillight, turn signals, brake light.
Chassis Stability:
Well-engineered chassis and suspension contribute to stability.
Features:
Basic for the era; typically includes analog gauges, odometer, trip meter, warning lights. Some RT/LT models might have basic radio/intercom preparation.
ABS:
Optional ABS system available on many variants, enhancing braking safety.
Diagnostic Ports:
Diagnostic port for connecting to BMW's diagnostic system (e.g., GT1 or DIS) for advanced fault finding.
ECU:
Bosch Motronic ECU controlling fuel injection and ignition timing.
Oil Change:
Every 10,000 km or annually, whichever comes first.
Air Filter Check:
Every 10,000 km, replace as needed.
Spark Plug Replacement:
Every 20,000 km.
Valve Clearance Check:
Every 20,000 km.
Brake Fluid Flush:
Every 2 years.
Engine Oil:
SAE 20W-50 Motorcycle Synthetic (e.g., Castrol Power 1 4T, Motul 5100 20W-50)
Brake Fluid:
DOT 4 or DOT 5.1 (Check manual for specific recommendation, but DOT 4 is common)
Fork Oil:
SAE 5W or 10W (Specific grade depends on model and preference; manual will specify exact grade and volume)
Common Wear Items:
Clutch wear, final drive seal leaks, alternator brushes, fuel pump reliability (early models), front fork seal leaks.
Electrical Gremlins:
Corrosion on connectors, failing ignition coils, starter relay issues (addressed by proper diagnostics).
Manufacturer:
Bayerische Motoren Werke AG (BMW)
Motorcycle Division:
BMW Motorrad has a long history of producing innovative and durable motorcycles, particularly known for its boxer-twin engines and shaft drive.
R Series:
The R850 is part of BMW's long-standing R series, which began with the R32 in 1923. The R850 serves as a slightly smaller displacement sibling to the popular R1100/R1150 series.
Production Period:
1994-2005 (as indicated by manual coverage)
Manufacturing Location:
Germany (primarily Berlin, Germany)
