Positioning:
Essential DIY and professional resource for owners of the iconic BMW R80 GS and R100 GS adventure motorcycles.
Comparative Value:
Provides detailed, accurate information often superior to generic online guides, enabling self-sufficiency in maintenance and repair.
Diagnostic Aid:
Enables accurate diagnosis and repair of complex issues through detailed schematics and troubleshooting guides.
Cost Savings:
Empowers owners to perform regular maintenance and repairs, significantly reducing workshop costs.
Value Preservation:
Helps maintain the motorcycle in optimal condition, preserving its value and reliability.
Engine:
Full engine overhaul, tuning, troubleshooting, component replacement (cylinder head, pistons, crankshaft, valve train)
Transmission:
Gearbox disassembly, inspection, repair, maintenance, lubrication
Drivetrain:
Final drive, driveshaft, universal joints, bevel gear maintenance and repair
Fuel System:
Carburetor tuning and overhaul (Bing Type), fuel tank, fuel lines, fuel pump inspection and replacement
Ignition System:
Ignition timing, spark plugs, ignition coils, electronic ignition system troubleshooting
Electrical System:
Wiring diagrams, battery, alternator, starter motor, lighting, instruments, switches
Braking System:
Brake pad replacement, caliper overhaul, brake fluid bleeding, disc and drum brake maintenance
Suspension:
Front forks (including Monolever for later models if applicable to 1984 context, though R80/R100 GS typically refers to the earlier Paralever era for this vintage), rear shock absorber, swingarm, bearings
Wheels Tires:
Wheel bearing maintenance, spoke tensioning, tire replacement and balancing
Frame Chassis:
Frame inspection, steering head bearing adjustment and replacement
Bodywork:
Fairing, seat, fenders, fuel tank removal and installation
Routine Maintenance:
Oil changes, filter replacements, valve clearance checks, spark plug replacement, lubrication points
Troubleshooting:
Diagnostic flowcharts, common fault identification, solutions for starting issues, performance problems, electrical faults
Engine Rebuild:
Step-by-step instructions for complete engine disassembly, part inspection, clearance measurements, reassembly, and torque specifications
Transmission Repair:
Detailed procedures for gearbox internal repairs, including gear selection mechanisms and bearings
Electrical Diagnostics:
Interpreting wiring diagrams, testing components, tracing electrical faults
Suspension Overhaul:
Front fork seal replacement, fork oil changes, rear shock absorber adjustments and replacement
Carburetor Adjustment:
Detailed instructions for setting idle speed, mixture, and synchronizing dual carburetors
Depth:
Comprehensive from basic user maintenance to full engine and transmission rebuilds, including diagnostic procedures.
Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder boxer engine
R80Gs Displacement:
797.5 cc
R100Gs Displacement:
980 cc
Bore X Stroke R80:
84.8 mm x 70.6 mm
Bore X Stroke R100:
94 mm x 70.6 mm
Compression Ratio R80:
8.2:1 (approx.)
Compression Ratio R100:
8.2:1 (approx.)
R80Gs Horsepower:
50 hp @ 6,500 rpm (approx.)
R100Gs Horsepower:
65 hp @ 6,500 rpm (approx.)
R80Gs Torque:
58 Nm @ 5,000 rpm (approx.)
R100Gs Torque:
77 Nm @ 5,000 rpm (approx.)
Carburetors:
Dual Bing 32mm (R80 GS) / Dual Bing 40mm (R100 GS)
Fuel Type:
Unleaded gasoline (min. 91 RON recommended)
Fuel Delivery:
Mechanical fuel pump
Crash Safety:
N/A (Motorcycle specific standards apply)
Brakes:
Dual disc front brake, single disc rear brake (typical configuration for this era)
Suspension Stability:
Robust telescopic front forks and Monolever/Paralever rear suspension contributing to stability.
Lighting:
Halogen headlight, taillight, turn signals
Instrumentation:
Speedometer, tachometer, indicator lights for neutral, oil pressure, turn signals, high beam
Oil Change:
Every 5,000 km or annually
Valve Check:
Every 10,000 km
Spark Plug Replacement:
Every 10,000 km or as needed
Engine Oil:
SAE 20W-50 (API SF or higher recommended), Capacity: 2.5 Liters (with filter change)
Gearbox Oil:
SAE 80W-90 GL-5 gear oil, Capacity: 0.5 Liters
Final Drive Oil:
SAE 80W-90 GL-5 gear oil, Capacity: 0.2 Liters
Brake Fluid:
DOT 4 (or DOT 3, check specific model recommendation)
Fork Oil:
Kayaba KYB 01B or equivalent (15W), Capacity: Approx. 185 ml per fork leg
Common Wear Item:
Clutch slave cylinder seals, output shaft seal, steering head bearings.
Engine Performance Quirks:
Carburetor synchronization can drift, requiring periodic adjustment for smooth running. Valve tappet noise if clearances are not maintained.
Electrical Challenges:
Corrosion in connectors, failing ignition switch, and rectifier/regulator issues can occur with age.
Brand Legacy:
BMW's long-standing tradition of producing durable, reliable motorcycles with a focus on engineering and rider comfort.
Gs Lineage:
The GS line, starting with the R80 G/S in 1980, pioneered the 'adventure touring' segment, combining off-road capability with long-distance comfort.
1984 Updates:
The 1984 models represent refinements on the original GS concept, with R100 GS offering increased power. Features like the Monolever single-sided swingarm were introduced around this period for improved handling and maintenance.
Manufacturing Location:
Berlin, Germany
Production Era:
The R80 GS and R100 GS were produced throughout the 1980s, with significant updates during this time.
