Target Audience:
BMW 'Airhead' motorcycle owners, mechanics, and enthusiasts seeking to maintain, repair, or restore their R 80 GS or R 100 R models.
Niche Appeal:
These models are highly regarded for their durability, off-road capability (R80GS), and robust engineering, making a comprehensive manual essential for ownership.
Manual Superiority:
Often supersedes generic Haynes or Clymer manuals with factory-level detail, crucial for complex BMW boxer engines and unique Monolever systems.
Original Documentation:
Based on official BMW factory service manuals, providing the most accurate and detailed information.
Diagnostic Tools:
Equipped with troubleshooting guides that can save significant time and expense in identifying and resolving issues.
Restoration Resource:
Invaluable for owners undertaking full restorations, providing part numbers (in some versions), schematics, and detailed assembly sequences.
Engine Systems:
Engine disassembly, assembly, troubleshooting, carburetion, ignition system, lubrication system, cooling system (air), exhaust system.
Transmission Systems:
Gearbox disassembly, assembly, maintenance, troubleshooting, clutch operation, driveshaft maintenance.
Chassis Systems:
Frame inspection and repair, front fork (telescopic and Monolever for R100R) overhaul, rear suspension (Monolever for R100R, dual shock for R80GS), wheel bearing maintenance, steering head bearing service.
Electrical Systems:
Wiring diagrams, lighting system, charging system (alternator, regulator), starting system, battery maintenance, instrument cluster troubleshooting.
Braking Systems:
Front and rear brake caliper overhaul, master cylinder service, brake fluid replacement, disc and pad inspection/replacement.
Fuel System:
Fuel tank maintenance, fuel line inspection, carburetor tuning and overhaul (Bing or Dell'Orto variants).
Bodywork And Trim:
Fairing removal and installation (if applicable), seat maintenance, luggage rack fitment, fender service.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, valve clearance adjustments, tire pressure checks, chain lubrication (if applicable, though most had shaft drive).
Troubleshooting:
Diagnostic procedures for common starting, running, and electrical issues.
Engine Rebuild:
Detailed instructions for top-end and potentially bottom-end engine overhauls, including torque specifications.
Transmission Repair:
Gearbox disassembly, inspection of gears and shifting mechanisms, reassembly procedures.
Suspension Overhaul:
Fork seal replacement, shock absorber servicing, spring replacement.
Electrical Diagnostics:
Testing of charging system components, ignition coil resistance, starter motor function.
Depth Level:
Comprehensive: Covers everything from basic owner maintenance to complete engine and transmission rebuilds.
Diagnostic Information:
Includes troubleshooting guides, common fault identification, and diagnostic steps.
Torque Specifications:
Provides detailed torque values for critical fasteners across all major components.
Wiring Diagrams:
Includes detailed electrical schematics for various model years and configurations.
Digital Format:
PDF (typically, searchable and printable)
Image Resolution:
High-resolution scans of original factory manuals, ensuring clarity of diagrams and text.
Physical Manual Binding:
N/A (for digital product, but if printed, would typically be coil-bound or perfect-bound for durability)
Physical Manual Paper:
N/A (for digital product, but original manuals often used heavy-duty paper)
R80Gs Engine Type:
Two-cylinder, four-stroke, boxer configuration, air-cooled
R80Gs Displacement:
797.5 cc
R100R Engine Type:
Two-cylinder, four-stroke, boxer configuration, air-cooled
R100R Displacement:
980 cc (often marketed as 1000cc)
R80Gs Horsepower:
Approx. 50 hp @ 6500 rpm (varies by year and market)
R100R Horsepower:
Approx. 65 hp @ 7250 rpm (varies by year and market)
R80Gs Torque:
Approx. 56 Nm (41 lb-ft) @ 5000 rpm
R100R Torque:
Approx. 78 Nm (57.5 lb-ft) @ 6000 rpm
Carburetors R80Gs:
Typically twin Bing 32mm or 40mm CV carburetors
Carburetors R100R:
Typically twin Bing 40mm CV carburetors
Fuel Type:
Unleaded gasoline (higher octane recommended)
Gearbox Type:
5-speed, constant mesh, foot-shifted sequential
Drive Type:
Shaft drive (BMW's Paralever system on R100R, Monolever on R80GS)
Gear Ratios:
Specific ratios vary by model year and configuration, detailed in manual.
Clutch Type:
Dry, single-plate, diaphragm spring clutch
Transmission Oil Spec:
API GL-5, SAE 90 or 75W-90 hypoid gear oil (check manual for exact spec and capacity)
Oil Change Interval:
Typically every 5,000 - 10,000 km (3,000 - 6,000 miles), or annually. Manual provides precise intervals.
Valve Adjustment Interval:
Every 10,000 - 20,000 km (6,000 - 12,000 miles), depending on conditions.
Spark Plug Replacement:
As per manual recommendations, often around 10,000 - 20,000 km.
Engine Oil Type:
Mineral or semi-synthetic motorcycle oil, viscosity typically SAE 20W-50 or SAE 15W-50. Manual will specify exact API rating and viscosity.
Engine Oil Capacity:
Approx. 2.5 - 3.0 liters (check manual for exact capacity with filter change).
Brake Fluid Type:
DOT 4 or DOT 3 brake fluid (check manual, DOT 4 preferred for modern standards).
Common Wear Items:
Clutch wear, exhaust header pipe leaks, electrical connector corrosion, output shaft seal leaks, aging fuel lines, fork seal leaks.
Engine Specific Notes:
Valve guide wear on high-mileage engines, possibility of cam chain wear, oil pressure sender issues.
Bmw Motorrad Legacy:
BMW Motorrad has a long history of producing durable, reliable, and technologically advanced motorcycles, particularly known for its boxer-twin engines and shaft drive.
R80Gs Introduction:
Launched in 1980, the R 80 G/S (Gelände/Straße - Off-road/Street) pioneered the adventure touring segment, combining BMW's boxer engine with a capable dual-sport chassis.
R100R Introduction:
The R 100 R, introduced later (early 90s), was a more road-oriented interpretation of the boxer platform, featuring the more advanced Monolever rear suspension system and often updated styling.
Production Period R80Gs:
1980-1987 (G/S), followed by R80GS variants.
Production Period R100R:
Early 1990s to mid-1990s.
Manufacturing Location:
Berlin, Germany (BMW Motorrad's primary manufacturing plant).
Model Legacy Recognition:
The R 80 G/S is widely considered a seminal model in the adventure motorcycle genre, often credited with creating the segment. Both models are celebrated for their engineering and enduring appeal.
Owner Satisfaction:
High owner satisfaction due to durability and timeless design, though requiring diligent maintenance.
Manual Accuracy:
Factory-level accuracy and detail, the benchmark for 'Airhead' maintenance.
