🏷️ Basic Information

Make:

BMW

Model:

R80 GS / R100 GS

Model Year:

1986

Chassis Codes:

247 (R80 GS), 248 (R100 GS)

Engine Codes:

117EG (R80 GS), 102EF (R100 GS)

👋 Introduction

Segment:

Dual-sport motorcycle

Positioning:

The R80GS and R100GS were pioneering models in the adventure touring segment, offering robust performance and off-road capability.

Competitors 1986:

Honda Transalp, Yamaha Tenere, Suzuki DR650/750S.

Engine Type:

Air-cooled boxer twin-cylinder

Drivetrain Gs Specific:

Paralever single-sided swingarm with shaft drive (introduced on GS models for reduced torque reaction).

Suspension Gs Specific:

Long-travel suspension for off-road capability.

Fuel Delivery:

Dual Bing carburetors.

📋 Manual Details

Topic Coverage:

Full service and repair instructions

Estimated Pages:

300+

Type:

Service Repair Workshop Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Detailed diagrams, disassembly, assembly, tuning, troubleshooting for both R80 and R100 boxer engines.

Transmission:

Gearbox maintenance, repair, overhaul, troubleshooting, lubrication.

Drivetrain:

Final drive (Paralever system), driveshaft, universal joints, clutch maintenance and repair.

Suspension:

Front forks (including telescopic fork maintenance, seal replacement), rear shock absorber (monoshock for GS models), Paralever rear suspension system adjustments and rebuild.

Brakes:

Front and rear brake systems (disc brakes), caliper maintenance, master cylinder rebuild, fluid replacement, bleeding procedures.

Electrical System:

Ignition system, charging system (alternator, voltage regulator), lighting, starter motor, battery, wiring diagrams, troubleshooting electrical faults.

Fuel System:

Carburetor service and tuning (Bing carburetors), fuel tank maintenance, fuel lines, fuel pump (if applicable).

Cooling System:

Oil cooling system maintenance (oil cooler, lines).

Exhaust System:

Exhaust manifold, muffler inspection and replacement.

Frame And Bodywork:

Frame inspection, fairing, seat, fuel tank removal and installation, fenders, luggage rack mounting.

Maintenance:

Routine servicing, oil changes, filter replacements, spark plug checks, valve adjustments, brake fluid changes, chain adjustment (if applicable).

Troubleshooting:

Systematic diagnostic procedures for common and uncommon issues, fault finding charts.

Repair:

Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation.

Overhaul:

Complete engine rebuild, gearbox overhaul, suspension component refurbishment.

Adjustments:

Carburetor synchronization, idle speed adjustment, ignition timing, suspension sag.

Specifications Torque:

Torque specifications for all critical fasteners.

Depth:

Comprehensive, covering everything from basic checks to full engine and transmission rebuilds, suitable for professional mechanics and experienced DIY enthusiasts.

📊 Manual Specifications

File Type:

PDF

Searchable Text:

Likely searchable text within PDF for efficient information retrieval.

Quality:

Digital reproduction of original factory documentation, ensuring clarity of text and diagrams.

Binding:

N/A (Digital PDF)

Paper:

N/A (Digital PDF)

⚙️ Engine Specifications

Type:

Air-cooled, four-stroke, boxer twin-cylinder

Bore X Stroke R80:

80.0 mm x 78.0 mm

Bore X Stroke R100:

94.0 mm x 70.7 mm

Displacement R80:

797.5 cc

Displacement R100:

980 cc

Compression Ratio R80:

8.2:1

Compression Ratio R100:

8.5:1

Horsepower R80:

50 HP @ 6500 rpm

Horsepower R100:

65 HP @ 7250 rpm

Torque R80:

57 Nm @ 4000 rpm

Torque R100:

70 Nm @ 6000 rpm

Carburetor Type:

2 x Bing 32mm CV (Constant Velocity) carburetors

Fuel Type:

Unleaded gasoline (premium)

Valve Actuation:

Overhead valves (OHV), pushrod actuated

Valve Clearance Spec Intake:

0.10 mm - 0.20 mm (cold)

Valve Clearance Spec Exhaust:

0.20 mm - 0.30 mm (cold)

🔧 Transmission

Type:

5-speed manual gearbox

Final Drive:

Shaft drive via Paralever system

Clutch Type:

Dry, single plate, diaphragm spring clutch

Gearbox Oil Spec:

SAE 75W/90 API GL-5 gear oil

Final Drive Oil Spec:

SAE 75W/90 API GL-5 gear oil

📐 Dimensions

Length Approx:

2200 mm

Width Approx:

800 mm

Height Approx:

1350 mm

Dry Weight R80:

197 kg

Dry Weight R100:

207 kg

Gross Vehicle Weight Rating Approx:

385 kg

Fuel Tank Capacity:

26 Liters (including 4-liter reserve)

🛡️ Safety Features

Safety Certification:

N/A (Motorcycle, certification standards vary by region).

Braking System:

Dual front disc brakes, single rear disc brake (typically Brembo or ATE).

Lighting:

Halogen headlight, integrated taillight/brake light, turn signals.

Chassis Design:

Steel tube frame for durability.

💡 Technology Features

Infotainment System:

N/A (No integrated infotainment system; basic analogue instrumentation).

Assistance Features:

N/A (Basic motorcycle design, no electronic rider aids).

Connectivity Features:

N/A

🔧 Maintenance

Oil Change Interval:

Every 10,000 km or annually, whichever comes first.

Valve Adjustment Interval:

Every 10,000 km.

Spark Plug Check Interval:

Every 10,000 km.

Brake Fluid Change Interval:

Every 2 years.

Engine Oil Type:

API SG or higher, SAE 20W-40 motorcycle specific oil (or as per manual: SAE 20W-50 or 10W-40 depending on climate).

Engine Oil Capacity:

Approx. 2.5 Liters (without filter change) / 3.0 Liters (with filter change)

Brake Fluid Type:

DOT 4

Clutch Lever Play:

Excessive clutch lever play can indicate worn clutch plates or cable adjustment issues.

Paralever Joint:

Wear in the Paralever pivot bearings can lead to clunking noises and imprecise handling.

Ignition Coil Failure:

Ignition coils can be prone to failure over time, affecting spark.

Carburetor Sync Drift:

Carburetors may require frequent synchronization to maintain smooth running.

Electrical Connections:

Corrosion on electrical connectors can cause intermittent faults.

📚 Vehicle History

Heritage:

BMW Motorrad has a long history of producing robust, reliable motorcycles, particularly known for their boxer engines and shaft drive.

Gs Lineage:

The R80GS and R100GS are direct descendants of the R80G/S, which established the GS (Gelände/Straße - Terrain/Street) concept.

Paralever Introduction:

The 1987 R100GS (and later 1988 R80GS) featured the revolutionary Paralever single-sided swingarm, significantly improving rear suspension performance and reducing shaft drive effects.

Production Years R80Gs:

1987-1990 (for the Paralever version, often referred to alongside the 1986 models, although the 1986 model year might reference earlier monolever versions or the start of production).

Production Years R100Gs:

1986-1996

Manufacturing Location:

Berlin, Germany

🏆 Awards & Recognition

Historical Recognition:

The R80GS and R100GS are widely recognized as iconic adventure motorcycles that defined a generation of dual-sport riding and have achieved cult status.