🏷️ Basic Information

Make:

BMW

Model:

R80GS / R100R

Production Years Covered:

1987-1996 (R80GS), 1991-1995 (R100R)

Engine Codes Covered:

247/1 (R80GS), 248/1 (R100R)

Chassis Codes Covered:

247 (R80GS), 248 (R100R)

👋 Introduction

Segment:

Dual-sport / Adventure Touring Motorcycles

Legacy:

Iconic BMW 'GS' series, renowned for durability, versatility, and off-road capability.

Competitors:

Honda Transalp, Yamaha Tenere, Suzuki DR Big, Kawasaki KLR, various European dual-sports of the era.

R80Gs Features:

Torquey 800cc boxer twin, robust chassis, long-travel suspension, reliable shaft drive, versatile for touring and mild off-road.

R100R Features:

More powerful 1000cc boxer twin, Monolever rear suspension for simpler maintenance and improved handling, increased touring comfort.

📋 Manual Details

Overall Coverage:

Comprehensive mechanical and electrical repair, maintenance, troubleshooting, and specifications for BMW R80GS and R100R motorcycles.

Estimated Page Count:

400-600 (typical for comprehensive service manuals covering multiple models/years)

Type:

Factory Service Manual / Workshop Manual

Language:

English

Format:

Digital (PDF) / Print (Paperback)

📖 Manual Coverage

Engine:

Detailed overhaul procedures for both R80GS (800cc) and R100R (1000cc) boxer engines, including cylinder head, valve train, piston, crankshaft, and lubrication system.

Transmission:

Complete coverage of the 5-speed gearbox, clutch assembly, and driveshaft.

Fuel System:

Carburetor tuning, overhaul, and specifications (Dell'Orto PHM40/PHB32 for R80GS, Bing 40mm for R100R), fuel tank and pump systems.

Electrical System:

Wiring diagrams, ignition system (points and electronic), charging system (alternator, regulator), starter motor, lighting, and instrumentation.

Suspension And Steering:

Front fork (including R100R's monolever or R80GS's twin-shock system), rear suspension (paralever for R100R, twin shocks for R80GS), steering head bearings, and wheel bearings.

Brakes:

Front and rear brake system diagnostics, caliper overhaul, master cylinder repair, hydraulic lines, and disc specifications.

Chassis And Bodywork:

Frame inspection, body panel removal and installation, seat, fenders, and luggage rack components.

Routine Maintenance:

Oil changes, filter replacements, spark plug service, air filter cleaning/replacement, chain adjustment (if applicable, though often shaft drive), brake pad replacement.

Engine Rebuild:

Complete engine disassembly, inspection, measurement, component replacement (piston rings, seals, gaskets), and reassembly procedures.

Troubleshooting Diagnostics:

Systematic fault finding for common issues related to starting, running, electrical, and braking problems, with diagnostic charts.

Component Overhaul:

Detailed instructions for rebuilding carburetors, brake calipers, master cylinders, fuel pumps, and transmission components.

Electrical Diagnosis:

Testing of ignition, charging, lighting, and starting systems using multimeters and diagnostic tools.

Depth:

Advanced diagnostic and repair procedures suitable for experienced mechanics and dedicated DIY enthusiasts. Covers complete engine teardowns, transmission overhauls, and detailed electrical troubleshooting.

📊 Manual Specifications

Digital Format Quality:

High-resolution scanned pages, searchable text where OCR is applied, bookmarked chapters for easy navigation.

Print Quality:

Clear, legible text and diagrams. Professional printing on durable paper suitable for workshop environments.

Binding Type:

Perfect binding or saddle-stitch for printed versions, ensuring pages lay flat for ease of use.

Paper Type:

Durable, gloss or matte finish paper to resist grease and dirt in a workshop setting.

⚙️ Engine Specifications

R80Gs Engine Type:

Air-cooled, four-stroke, two-cylinder boxer engine

R80Gs Displacement:

797.5 cc

R80Gs Bore X Stroke:

84.8 mm x 70.6 mm

R80Gs Compression Ratio:

8.2:1

R100R Engine Type:

Air-cooled, four-stroke, two-cylinder boxer engine

R100R Displacement:

980 cc

R100R Bore X Stroke:

94 mm x 70.6 mm

R100R Compression Ratio:

8.5:1

R80Gs Horsepower:

50 HP (37 kW) at 6500 rpm

R80Gs Torque:

56 Nm (41 lb-ft) at 5000 rpm

R100R Horsepower:

60 HP (44 kW) at 6500 rpm

R100R Torque:

70 Nm (52 lb-ft) at 3750 rpm

R80Gs Carburetors:

2 x Dell'Orto PHM 40 PD/PHB 32 (depending on market/year)

R100R Carburetors:

2 x Bing 40mm

Fuel Type:

Unleaded gasoline, 90-95 octane (RON/MON)

🔧 Transmission

Type:

5-speed constant mesh gearbox

Final Drive:

Shaft drive with bevel gear

Clutch:

Dry single plate, diaphragm spring clutch (R80GS), hydraulic actuation.

R100R Rear Suspension Drive:

Monolever single-sided swingarm with shaft drive.

📐 Dimensions

R80Gs Length:

Approx. 2250 mm (88.6 in)

R80Gs Width:

Approx. 900 mm (35.4 in)

R80Gs Height:

Approx. 1390 mm (54.7 in)

R100R Length:

Approx. 2185 mm (86.0 in)

R100R Width:

Approx. 870 mm (34.3 in)

R100R Height:

Approx. 1350 mm (53.1 in)

R80Gs Dry Weight:

Approx. 196 kg (432 lbs)

R80Gs Wet Weight:

Approx. 210 kg (463 lbs)

R100R Dry Weight:

Approx. 200 kg (441 lbs)

R100R Wet Weight:

Approx. 215 kg (474 lbs)

Fuel Tank Capacity:

26 Liters (6.9 US gal), including reserve

🛡️ Safety Features

Safety Standard:

Designed to meet prevailing international motorcycle safety standards for the era.

Braking System:

Dual disc front brake (often Brembo), single disc rear brake. ABS was not standard for these models.

Lighting:

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

Frame Construction:

Treated steel tubular frame providing structural integrity.

💡 Technology Features

Features:

Basic instrumentation: speedometer, tachometer, odometer, fuel gauge, warning lights. No integrated infotainment systems as per modern standards.

Features:

None. Focus is on mechanical reliability and rider feedback.

Features:

No electronic connectivity features.

🔧 Maintenance

Oil Change Interval:

Every 5,000 km or 6 months (refer to specific manual for exact details)

Valve Clearance Check:

Every 10,000 km or 12 months

Spark Plug Replacement:

Every 10,000 km or 12 months

Engine Oil Type:

SAE 20W-50 or 10W-40 (API SF/SG or higher, consult manual for precise recommendations)

Engine Oil Capacity:

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

Gearbox Oil Type:

SAE 90 Hypoid Gear Oil (API GL-4 or GL-5, check manual)

Gearbox Oil Capacity:

Approx. 0.9 Liters (0.95 US qt)

Final Drive Oil Type:

SAE 90 Hypoid Gear Oil (API GL-4 or GL-5, check manual)

Final Drive Oil Capacity:

Approx. 0.25 Liters (0.26 US qt)

Brake Fluid Type:

DOT 4

Electrical Connections:

Corrosion or looseness in connectors and wiring harness, particularly at ignition coils and grounds.

Carburetor Issues:

Diaphragm leaks or wear, pilot jet clogging, leading to rough idling or poor throttle response.

Paralever Pivot Bearings:

Wear in the pivot bearings of the Paralever system can cause play and affect handling.

Clutch Slave Cylinder Seals:

Leaking seals in the clutch slave cylinder can lead to clutch disengagement issues.

Pushrod Tube Seals:

Seals on the pushrod tubes can degrade over time, leading to oil leaks.

📚 Vehicle History

Bmw Motorrad History:

BMW Motorrad has a long history of producing robust, reliable motorcycles, particularly known for their boxer engines and shaft drive systems since the 1920s.

Gs Series Origin:

The GS line originated from BMW's off-road competition bikes (like the GS Trophy winning R80G/S) and evolved into the premier dual-sport adventure motorcycles.

R80Gs Development:

The R80GS, launched in 1987, was a significant evolution of the R80G/S, introducing the Paralever rear suspension system for improved ride quality and handling.

R100R Development:

The R100R, introduced in 1991, featured the larger 1000cc engine and further refined the Monolever system, aiming for a more comfortable and powerful touring experience.

Manufacturing Location:

Berlin, Germany

🏆 Awards & Recognition

Reputation:

Highly regarded for their durability, adventure touring capability, and longevity. Considered classics in the dual-sport segment.