BMW R80 GS R100 R 1979 Service Repair Workshop Manual

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This manual covers the R80 GS and R100 R models from 1979. These motorcycles are renowned for their robust air-cooled boxer twin engines, known for their torque and durability. The...

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Taper: Motorcycle

Distributeur:

UGS: 73564

Mots clés: 1979 BMW Cars Misc Motorcycle R100 R R80 GS

Variantes de produits

Description

This manual covers the R80 GS and R100 R models from 1979. These motorcycles are renowned for their robust air-cooled boxer twin engines, known for their torque and durability. The GS models feature long-travel suspension for off-road capability, while the R models are designed for road touring. A key engineering feature across both is the shaft drive, which simplifies maintenance compared to chain-driven systems. These bikes represent a significant era in motorcycle heritage, building on decades of experience with the boxer engine platform and offering a blend of performance and reliability for dual-purpose and touring use. This comprehensive workshop and service manual provides essential information for the maintenance, repair, and troubleshooting of your R80 GS or R100 R. It details procedures for routine maintenance, engine overhauls, transmission service, suspension and brake repairs, and electrical system diagnostics. The manual includes specific technical specifications, torque values, clearances, and detailed wiring diagrams. It is designed to assist owners, mechanics, and technicians in keeping these iconic motorcycles in optimal working condition, covering everything from basic fluid changes to in-depth component rebuilds.

🏷️ Basic Information

Identification

Make:

Model:

R80 GS, R100 R

Year:

👋 Introduction

Market Position

Vehicle Segment:

Dual-purpose / Adventure touring motorcycle

Competitive Analysis

Contemporary Rivals:

Honda Transalp (later), Yamaha Tenere (later), Moto Guzzi V50/V65, perhaps some larger Japanese dual-sports

Key Features

Engine Type:

Air-cooled flat-twin (boxer) engine, known for torque and durability

Drivetrain:

Shaft drive, reducing maintenance compared to chain drives

Suspension Gs:

Long-travel suspension for off-road capability (GS models)

📋 Manual Details

Coverage Areas

Primary Coverage:

Service, Repair, Workshop

Page Count

Estimated Pages:

Comprehensive (specific count not provided in product info, but typical for this era and scope)

Manual Type

Type:

Workshop Manual / Service Manual

Language

Language:

English (assumed based on common manual distribution)

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

BMW boxer twin engine (R80, R100 variants)

Fuel System:

Carburetor systems (e.g., Bing), fuel delivery, fuel tank, fuel lines

Ignition System:

Ignition timing, spark plugs, ignition coils, electronic ignition (if applicable to 1979 models)

Transmission:

Gearbox, clutch, driveshaft, final drive

Frame And Suspension:

Chassis, forks, rear shock absorbers, swingarms, steering head bearings

Brakes:

Front and rear braking systems (drum and disc, depending on model variant), hydraulic lines, brake fluid

Electrical System:

Wiring diagrams, battery, charging system (alternator, rectifier), lighting, instruments, starter motor

Wheels And Tires:

Wheel bearing maintenance, tire pressure specifications, wheel mounting

Bodywork And Fairings:

Tank, seat, fenders, side covers, any associated fairings for GS models

Procedures Included

Routine Maintenance:

Oil changes, filter replacement, spark plug checks, chain adjustment (if applicable), brake adjustments, lubrication points

Engine Overhaul:

Piston/cylinder inspection/replacement, valve adjustments, crankshaft inspection, gasket replacement

Transmission Service:

Gearbox oil changes, clutch adjustment/replacement, final drive lubrication

Suspension Repair:

Fork seal replacement, shock absorber service, steering head bearing service

Brake System Repair:

Bleeding brakes, pad/shoe replacement, caliper/master cylinder service

Electrical Troubleshooting:

Diagnosis of lighting issues, charging problems, starting circuit faults

Carburetor Tuning:

Adjustment of fuel mixture, idle speed, jetting information

Technical Depth

Depth Level:

Comprehensive (from basic maintenance to full engine and transmission rebuilds)

Diagnostic Coverage:

Troubleshooting guides, symptom-based diagnostics

Rebuild Specifications:

Clearances, torque values, tolerances for all major components

📊 Manual Specifications

File Format

PDF Quality:

High-resolution (assumed for workshop manual, enabling clear diagrams and text)

Searchability:

Searchable text content (typical for well-produced PDF manuals)

Print Quality

Printable:

Printable pages for workshop use

Binding Type

Physical Binding:

N/A (PDF format)

Paper Type

Physical Paper:

N/A (PDF format)

⚙️ Engine Specifications

Primary Engine

Engine Layout:

Flat-twin (Boxer), air-cooled

R80 Engine Displacement:

797.5 cc

R100 Engine Displacement:

979.5 cc

Bore X Stroke R80:

82 mm x 75 mm (approximate)

Bore X Stroke R100:

94 mm x 74 mm (approximate)

Compression Ratio Typical:

8.2:1 or 9.0:1 (depending on specific variant)

Performance

R80 Horsepower:

Around 50 HP (DIN) at 6500 RPM

R100 Horsepower:

Around 65 HP (DIN) at 7250 RPM

R80 Torque:

Around 57 Nm (42 lb-ft) at 5000 RPM

R100 Torque:

Around 70 Nm (52 lb-ft) at 5500 RPM

Fuel System

Carburetor Type:

Twin Bing carburetors (e.g., 32mm or 40mm depending on model)

Fuel Requirement:

Unleaded gasoline (91 RON minimum typically, though some earlier models may have preferred leaded or required additives)

🔧 Transmission

Standard

Transmission Type:

5-speed constant mesh manual gearbox

Clutch Type:

Dry single-plate clutch

Final Drive:

Shaft drive to rear wheel

Features

Gear Ratios:

Specific ratios documented within the manual

📐 Dimensions

Exterior

Wheelbase R80Gs:

Approx. 1450 mm (57.1 in)

Wheelbase R100R:

Approx. 1450 mm (57.1 in)

Weights

Dry Weight R80Gs:

Approx. 185 kg (408 lbs)

Dry Weight R100R:

Approx. 190 kg (419 lbs)

Fuel Capacity:

Approx. 18 liters (4.75 US gal), including reserve

🛡️ Safety Features

Passive Features

Frame Construction:

Tubular steel frame, renowned for rigidity and durability

💡 Technology Features

Infotainment

Instrumentation:

Analog speedometer, tachometer, odometer, neutral indicator, oil pressure light, high beam indicator

Driver Assistance

Not applicable for 1979 models

Connectivity

Digital Features:

Not applicable for 1979 models

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 5,000-10,000 km (3,000-6,000 miles) or annually, refer to manual for exact spec

Valve Adjustment Interval:

Around 10,000 km (6,000 miles)

Spark Plug Replacement:

Typically every 10,000-20,000 km (6,000-12,000 miles)

Fluid Specifications

Engine Oil Type:

SAE 20W/50 or 20W/40 motorcycle-specific oil (check manual for exact viscosity and API rating)

Engine Oil Capacity:

Approx. 2.5 - 3.0 liters (depending on filter change)

Transmission Oil Type:

Gear oil, e.g., SAE 80W/90 (check manual for exact spec)

Final Drive Oil Type:

Gear oil, e.g., SAE 80W/90 (check manual for exact spec)

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid (check manual for specific requirement)

Known Issues

Common Wear Items:

Clutch wear, swingarm pivot bearings, steering head bearings, fork seals

Electrical Gremlins:

Potential for aging wiring harness issues, contact point corrosion

Carburetor Idling:

Carburetors may require regular cleaning and adjustment for smooth idling

📚 Vehicle History

Brand Heritage

Bmw Motorcycle Legacy:

BMW's long history in motorcycle manufacturing, particularly with the boxer engine dating back to the 1920s

Model Evolution

R Series Development:

Evolution of the R-series touring bikes, with the GS models introducing off-road capability and the 'R' models focusing on road touring

Gs Origin:

The GS (Gelände/Straße - Terrain/Street) designation signifies the dual-purpose design, inspired by BMW's success in off-road events

Production

Era Context:

These models represent the late 1970s iteration of BMW's enduring R series, a period of refinement and adaptation