🏷️ Basic Information

Make:

BMW

Model:

R80 GS / R100 GS

Model Series:

R Series Airhead (Dual Sport)

Chassis Codes:

247E (R80GS), 247E (R100GS)

Vehicle Type:

Dual Sport Motorcycle

👋 Introduction

Segment:

Iconic dual-sport motorcycles, renowned for their ruggedness and versatility for on-road and off-road touring.

Competitors:

Competed against bikes like Yamaha XT600, Honda Africa Twin (later models), Kawasaki KLR650.

Engine Type:

Air-cooled, horizontally opposed twin-cylinder ('boxer')

Drivetrain Type:

Shaft drive

Suspension Design:

Long-travel suspension, Monolever rear suspension (from 1987 onwards for R100GS, R80GS) or dual shocks (earlier GS models).

Durability:

Known for robust construction and reliability for long-distance travel and adventure riding.

📋 Manual Details

Engine:

Yes

Transmission:

Yes

Drivetrain:

Yes

Suspension:

Yes

Brakes:

Yes

Electrical System:

Yes

Fuel System:

Yes

Exhaust System:

Yes

Frame And Bodywork:

Yes

Wheels And Tires:

Yes

Tools And Special Equipment:

Yes

Troubleshooting:

Yes

Estimated Pages:

Varies by specific edition, typically 300-500+ pages

Type:

Workshop Repair Service Manual

Language:

English (likely, based on product description)

Format:

Downloadable PDF

📖 Manual Coverage

Engine Internals:

Cylinder head, valves, pistons, connecting rods, crankshaft, lubrication system, timing

Fuel Delivery:

Carburetor overhaul (Bing), fuel tank, fuel lines, fuel pump (if applicable)

Ignition System:

Ignition timing, spark plugs, coils, electronic ignition components

Transmission Gearbox:

Gear shifting mechanism, clutch operation, gearbox disassembly and assembly

Final Drive:

Driveshaft, universal joint, rear axle housing, final drive gears, bearings

Front Suspension:

Telescopic forks, fork seals, oil levels, springs, steering head bearings

Rear Suspension:

Monolever swingarm, shock absorber, linkage system (if applicable), pivot bearings

Braking System:

Hydraulic brake system, brake levers, master cylinders, calipers, brake discs, brake pads, bleeding procedures

Electrical Components:

Wiring diagrams, battery, starter motor, alternator, lights, horn, switches, fuses

Chassis And Frame:

Frame inspection, subframe, mounting points

Routine Maintenance:

Oil changes, filter replacement, spark plug checks, valve clearance adjustments, chain lubrication/adjustment (if applicable)

Engine Rebuild:

Top-end and bottom-end engine overhauls, component replacement

Carburetor Tuning:

Adjustment, cleaning, and synchronization of Bing carburetors

Fork Rebuild:

Fork seal replacement, oil level correction, spring replacement

Shock ABSorber Service:

Adjustment, replacement

Brake Bleeding:

Proper procedure for removing air from the hydraulic brake system

Electrical Diagnostics:

Troubleshooting common electrical faults using wiring diagrams

Wheel Balancing:

Tire mounting and wheel balancing procedures

Bodywork Repair:

Fairing, fuel tank, and fender removal/installation

Depth:

Comprehensive: Covers all aspects from basic maintenance to complete engine and component rebuilds.

Diagnostic Capabilities:

Includes common problems, symptoms, and diagnostic procedures.

Torque Specifications:

Detailed torque values for all critical fasteners.

Illustrations:

Clear, step-by-step illustrations and diagrams.

📊 Manual Specifications

Format:

PDF

Searchability:

Typically text-searchable for easy information retrieval.

Quality:

High-resolution for clear viewing of diagrams and text.

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

R80Gs Engine Type:

Air-cooled, four-stroke, horizontally opposed twin-cylinder (boxer)

R80Gs Displacement:

797.5 cc (48.7 cu in)

R80Gs Bore X Stroke:

84.8 mm x 70.6 mm

R100Gs Engine Type:

Air-cooled, four-stroke, horizontally opposed twin-cylinder (boxer)

R100Gs Displacement:

980 cc (59.8 cu in)

R100Gs Bore X Stroke:

94 mm x 70.6 mm

R80Gs Horsepower:

Approx. 50 hp (37 kW) @ 6,500 rpm

R80Gs Torque:

Approx. 56 Nm (41 lb-ft) @ 5,000 rpm

R100Gs Horsepower:

Approx. 65 hp (48 kW) @ 7,000 rpm

R100Gs Torque:

Approx. 70 Nm (52 lb-ft) @ 5,500 rpm

Carburetion:

Dual Bing Constant Velocity (CV) carburetors (e.g., 32mm for R80GS, 40mm for R100GS)

Fuel Type:

Unleaded gasoline

Fuel Capacity:

Approx. 24 liters (6.3 US gal), including reserve

🔧 Transmission

Type:

5-speed manual gearbox

Clutch:

Single dry plate clutch, hydraulically operated

Final Drive:

Shaft drive to rear wheel

📐 Dimensions

Length:

Varies by model year and specific configuration, typically around 2200 mm (86.6 in)

Width:

Approx. 800 mm (31.5 in) at handlebars

Height:

Varies by model and seat height, approx. 1300 mm (51.2 in) to top of screen

Wheelbase:

Approx. 1430 mm (56.3 in)

Dry Weight:

R80GS: Approx. 190 kg (419 lbs); R100GS: Approx. 200 kg (441 lbs)

Gross Vehicle Weight Rating:

Approx. 390 kg (860 lbs)

🛡️ Safety Features

Crash Test Data:

N/A (Motorcycle specific crash testing standards differ significantly from automobiles)

Braking System:

Dual front disc brakes, single rear disc brake (dual piston calipers common on later models)

Suspension Handling:

Long-travel suspension designed for varied terrain, offering stability and control.

Lighting:

Halogen headlight, taillight, turn signals.

Frame Construction:

Robust tubular steel frame for structural integrity.

💡 Technology Features

Features:

Minimal by modern standards; primarily focused on mechanical operation. Features typically include analog gauges (speedometer, tachometer), odometer, trip meter, and indicator lights.

Features:

None (N/A for this era of motorcycle).

Features:

None (N/A for this era of motorcycle).

🔧 Maintenance

Oil Change:

Every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually, depending on usage. Refer to manual for exact intervals.

Valve Adjustment:

Every 10,000 - 20,000 km (6,000 - 12,000 miles), or as per manual recommendations.

Spark Plug Check:

Every 10,000 km (6,000 miles)

Brake Fluid Flush:

Every 2 years

Engine Oil Type:

API SG or higher, SAE 20W-50 or 10W-40 recommended. Refer to manual for precise specifications.

Engine Oil Capacity:

Approx. 2.5 liters (2.6 US qt) with filter change

Transmission Oil Type:

SAE 90 Hypoid gear oil (GL-5)

Transmission Oil Capacity:

Approx. 0.9 liters (0.95 US qt)

Final Drive Oil Type:

SAE 90 Hypoid gear oil (GL-5)

Final Drive Oil Capacity:

Approx. 0.2 liters (0.21 US qt)

Fork Oil Type:

Brake fluid DOT 4 or specific motorcycle fork oil (e.g., 5W or 10W, depending on model year and preference)

Fork Oil Quantity:

Refer to manual; typically 200-230ml per fork leg

Engine Wear:

Oil leaks from the cylinder base gaskets or pushrod seals are common. Valve stem seals can degrade over time.

Electrical Issues:

Aging wiring harnesses can cause intermittent electrical problems. Alternator and starter motor brushes can wear out.

Transmission Reliability:

Generally robust, but clutch slave cylinder seals can fail. Gear selector indexing can sometimes be imprecise if not maintained.

Suspension Wear:

Fork seals are prone to leaks. Rear shock absorber may lose damping over time, especially on high-mileage bikes.

Fuel System Degradation:

Rubber fuel lines can perish. Carburetor internal components (diaphragms, jets) can become gummed up if the bike sits for extended periods.

Monolever Joint:

The universal joint in the Monolever system can wear, leading to clunking noises under acceleration/deceleration.

📚 Vehicle History

Legacy:

BMW Motorrad has a long history of producing durable, reliable motorcycles, particularly the boxer-twin R series, dating back to the mid-20th century.

Gs Lineage:

The 'GS' (Gelände/Straße - Terrain/Street) designation originated with the R80G/S in 1980, establishing the adventure-touring segment. The R80GS and R100GS models were direct successors, expanding the engine displacement and capabilities.

R100Gs Introduction:

Introduced in 1987 as an evolution of the R80G/S and R80GS, featuring the larger 1000cc engine and the new Monolever single-sided swingarm/driveshaft system.

R80Gs Introduction:

Introduced in 1987 as a slightly smaller displacement version of the GS concept, often sharing many components with the R100GS.

Production Years:

R80GS: 1987-1990 (approx.); R100GS: 1987-1995 (approx.)

Manufacturing Location:

Berlin, Germany

🏆 Awards & Recognition

Motorcycle Legacy:

Widely regarded as classic adventure touring motorcycles, highly sought after by enthusiasts for their durability and classic appeal. Often featured in 'best adventure bikes of all time' lists.

Owner Satisfaction:

High owner satisfaction due to reliability and the unique riding experience. However, maintenance requires more hands-on knowledge compared to contemporary bikes.

Emission Standards:

Compliant with emission standards of their respective production years, which were less stringent than modern requirements.