Market Position:
Essential resource for owners and mechanics of the iconic BMW R80GS and R100GS adventure motorcycles.
Competitive Advantage:
Provides in-depth, professional-level repair and maintenance information that surpasses basic owner's manuals, enabling owners to perform complex tasks.
Key Feature 1:
Covers both R80GS and R100GS variants, maximizing utility for owners of either model.
Key Feature 2:
Detailed diagrams and illustrations crucial for visual understanding of procedures.
Key Feature 3:
Authoritative information trusted by professional technicians.
Primary Coverage:
Service, Repair, Workshop
Estimated Page Count:
Extensive (typical for comprehensive workshop manuals, often 500+ pages)
Manual Type:
Workshop Manual / Service Manual
Language:
English (common for international sales, but check specifics if possible)
Engine Service And Repair:
Full coverage including disassembly, assembly, inspection, and adjustment of all engine components.
Transmission And Drivetrain:
Detailed procedures for gearbox, clutch, driveshaft, and final drive maintenance and repair.
Chassis And Suspension:
Front forks (including BMW's monolever system), rear swingarm, shock absorbers, and steering head bearings.
Braking System:
Front and rear brake systems, including caliper overhauls, fluid changes, and adjustment.
Electrical System:
Wiring diagrams, component testing, ignition system, lighting, charging system, and starter motor.
Fuel System:
Carburetor service (likely Bing or similar), fuel tank, fuel lines, and fuel pump (if applicable).
Exhaust System:
Inspection and replacement of exhaust components.
Bodywork And Frame:
Minor bodywork, frame inspection, and component removal/installation.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, chain adjustment, valve clearance checks and adjustments.
Troubleshooting Guides:
Diagnostic procedures for common problems and symptom-based fault finding.
Engine Rebuilding:
Detailed steps for engine disassembly, component inspection, machining specifications, and reassembly.
Suspension Overhaul:
Fork seal replacement, fork oil changes, shock absorber servicing.
Carburetor Tuning And Rebuild:
Step-by-step instructions for carburetor cleaning, adjustment, and rebuild.
Electrical Diagnostics:
Testing and repair of electrical circuits, charging system issues, ignition timing adjustments.
Depth Of Information:
Comprehensive: Covers everything from basic rider maintenance to full engine and gearbox overhauls, suitable for professional mechanics and experienced DIY enthusiasts.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder (Boxer)
Displacement R80:
797.5 cc
Displacement R100:
980 cc
Bore X Stroke R80:
82.5 mm x 75 mm (typical)
Bore X Stroke R100:
94 mm x 70.7 mm (typical)
Compression Ratio:
8.2:1 to 9.5:1 (varies by specific model/year)
Horsepower R80:
~50 hp @ 6500 rpm (estimated)
Horsepower R100:
~65 hp @ 7250 rpm (estimated)
Torque R80:
~57 Nm @ 5000 rpm (estimated)
Torque R100:
~70 Nm @ 5500 rpm (estimated)
Carburetor Type:
Typically dual Bing constant-velocity carburetors (e.g., 32mm or 40mm depending on model)
Fuel Type:
Unleaded gasoline (premium recommended)
Fuel Capacity:
Approx. 19-21 liters (including reserve)
Transmission Type:
5-speed manual constant mesh gearbox
Optional Transmission:
N/A (all models were manual)
Clutch Type:
Single dry plate, hydraulically actuated
Final Drive:
Shaft drive with enclosed universal joint and final drive unit
Safety Ratings:
Not applicable in the modern sense; focus is on mechanical integrity and rider control.
Active Safety Features:
Effective dual disc front brakes, single disc rear brake, robust chassis, responsive steering.
Passive Safety Features:
Sturdy frame construction, rider positioned for good visibility.
Oil Change Interval:
Typically every 5,000 - 10,000 km or annually, depending on usage and manufacturer recommendations.
Valve Clearance Interval:
Every 10,000 km (critical for boxer engines)
Spark Plug Replacement:
Every 10,000 - 20,000 km
Brake Fluid Change:
Every 2 years
Engine Oil Type:
SAE 20W-50 or 10W-40 motorcycle specific oil, meeting API SG or higher.
Engine Oil Capacity:
Approx. 2.5 - 3.0 liters (including filter change)
Transmission Oil Type:
GL-5 SAE 80W-90 gear oil
Final Drive Oil Type:
GL-5 SAE 80W-90 gear oil
Known Issue 1:
Oil leaks (common at cylinder head gaskets, pushrod tubes, and output shaft seals).
Known Issue 2:
Wear in the Monolever pivot and driveshaft splines.
Known Issue 3:
Carburetor synchronization and adjustment drift.
Known Issue 4:
Electrical component reliability (especially switches and charging system components).
Brand Heritage:
BMW has a long and storied history in motorcycle manufacturing, particularly known for its durable and reliable boxer-twin engines and shaft drive systems, dating back to the R32 in 1923.
Gs Series Origin:
The 'GS' designation (for Gelände/Straße or Off-road/Street) was pioneered by the R80G/S in 1980, revolutionizing the dual-sport motorcycle segment. The R80GS and R100GS models are direct descendants, refining the concept with larger engines and the Monolever rear suspension.
R100Gs Introduction:
The R100GS was introduced to provide more power and torque for touring and laden riding, building on the success of the R80GS.
Production Period:
The R80GS and R100GS models were produced throughout the 1980s and into the early 1990s, with significant updates during this time.
Manufacturing Location:
Berlin, Germany (BMW Motorrad)
