🏷️ Basic Information

Make:

BMW

Model:

R 1150 GS

Year:

1998

Internal Model Code:

R21

👋 Introduction

Segment:

Adventure Touring Motorcycle

Reputation:

Renowned for its versatility, durability, and capability for long-distance travel and off-road excursions.

Competitors Circa 1998:

Honda Africa Twin, Yamaha Super Tenere, Triumph Tiger, Suzuki V-Strom (later models).

Engine Configuration:

Boxer-twin, air/oil-cooled

Drivetrain:

Shaft drive

Suspension:

BMW's signature Telelever front suspension for improved handling and comfort.

📋 Manual Details

Primary Coverage:

Repair and Service

Secondary Coverage:

Maintenance, Troubleshooting, Diagnostics

Estimated Pages:

Comprehensive (specific count not provided, but typical for a full service manual is 500+ pages)

Type:

Service Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Detailed overhaul, component testing, tuning, fuel injection system (BMS-K/D), ignition system, exhaust system.

Transmission:

Clutch, gearbox operation, maintenance, repair, final drive, driveshaft, lubrication.

Chassis:

Frame, suspension (Telelever front, Paralever rear), steering, wheels, tires.

Electrical System:

Wiring diagrams, lighting, battery, alternator, starter, ABS II, instrument cluster, electronic control units (ECUs).

Brakes:

Hydraulic system, ABS II operation and maintenance, brake pad replacement, rotor inspection, bleeding procedures.

Fuel System:

Fuel pump, injectors, pressure regulator, fuel filter replacement, tank maintenance.

Routine Maintenance:

Oil changes, filter replacements, spark plug service, valve clearance checks, lubrication points.

Troubleshooting:

Diagnostic procedures for common and uncommon faults, error code interpretation (where applicable).

Repair Procedures:

Step-by-step instructions for engine disassembly/reassembly, transmission overhaul, suspension component replacement, electrical component repair.

Diagnostic Procedures:

Fault finding using visual inspection, measurement tools, and potentially diagnostic equipment (if covered).

Depth:

Professional technician level, suitable for complete engine rebuilds, advanced electrical diagnostics, and complex component replacements.

📊 Manual Specifications

File Type:

PDF (Portable Document Format)

Searchability:

Likely text-searchable if properly generated from a digital source.

Resolution:

Dependent on original source, typically clear enough for print reproduction.

Binding:

N/A (Digital Download)

Paper Quality:

N/A (Digital Download)

⚙️ Engine Specifications

Type:

Four-stroke Boxer-twin

Displacement:

1130 cc

Bore X Stroke:

98 mm x 74.5 mm

Cooling System:

Air/oil-cooled

Valve Train:

2 valves per cylinder, Overhead Camshaft (OHC), actuated by pushrods and rockers.

Horsepower:

Approx. 95 hp @ 7250 rpm

Torque:

Approx. 98 Nm (72 lb-ft) @ 5500 rpm

Fuel Delivery:

Electronic Fuel Injection (EFI), Bosch Motronic BMS-K/D

Fuel Type:

Unleaded gasoline, minimum 91 RON

Oil Type:

SAE 20W-40 or SAE 15W-50 motorcycle-specific oil

Oil Capacity:

Approx. 4.0 liters (with filter change)

🔧 Transmission

Type:

6-speed manual gearbox

Clutch:

Single dry plate, diaphragm spring

Final Drive:

Shaft drive to rear wheel

Gear Ratios:

Refer to manual for specific ratios (typical for adventure bikes).

Transmission Oil:

SAE 75W-90 GL-5 gear oil

Transmission Oil Capacity:

Approx. 0.25 liters (gearbox), refer to manual for final drive oil.

📐 Dimensions

Length:

Approx. 2230 mm (87.8 in)

Width:

Approx. 915 mm (36.0 in) (at handlebars)

Height:

Approx. 1435 mm (56.5 in) (at seat)

Wheelbase:

Approx. 1487 mm (58.5 in)

Dry Weight:

Approx. 230 kg (507 lbs)

Gross Vehicle Weight Rating:

Refer to manual for specific GVWR.

Fuel Tank Capacity:

25 liters (6.6 US gal) including a 4-liter reserve.

🛡️ Safety Features

Safety Features Rating:

N/A for motorcycles in the same manner as cars.

ABS:

Optional BMW Motorrad Integral ABS II (anti-lock braking system).

Brakes Front:

Dual 305mm discs with 4-piston calipers.

Brakes Rear:

Single 276mm disc with 2-piston caliper.

Lighting:

Halogen headlight, LED taillight, turn signals.

Chassis Design:

Sturdy frame and suspension designed for stability and control.

💡 Technology Features

Infotainment System:

N/A (Basic instrumentation, focus on function over entertainment).

ABS System:

Integral ABS II (optional) - advanced for its time, integrating front and rear brake actuation.

Diagnostic Ports:

Diagnostic connector for electronic troubleshooting (e.g., with BMW diagnostic tools).

Instrument Cluster:

Analog speedometer and tachometer, LCD display for fuel level, odometer, clock, gear indicator (if equipped), warning lights.

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 km or annually, whichever comes first.

Valve Clearance Check:

Typically every 20,000 km.

Spark Plug Replacement:

Refer to manual, often around 20,000-40,000 km depending on plug type.

Engine Oil Spec:

SAE 20W-40 or SAE 15W-50 Motorcycle-specific.

Brake Fluid Spec:

DOT 4 (High-temperature racing fluid recommended for best performance).

Transmission Oil Spec:

SAE 75W-90 GL-5 Gear Oil.

Common Wear Items:

Clutch wear, driveshaft splines lubrication, Telelever dust seals, alternator rotor failure (in some years).

Electrical Gremlins:

Can be prone to minor electrical faults if not properly maintained or modified; manual aids diagnosis.

Schedule Detail:

Manual provides detailed, mileage-based, and time-based service schedules.

📚 Vehicle History

Manufacturer:

Bayerische Motoren Werke AG (BMW)

Motorcycle Division History:

BMW has a long and distinguished history in motorcycle manufacturing, dating back to the 1920s, with a strong focus on engineering and innovation.

R Series Legacy:

The R 1150 GS is part of the highly successful 'GS' (Gelände/Straße - Off-road/Street) line, which began with the R80G/S in 1980, setting the standard for adventure touring motorcycles.

Predecessor:

R 1100 GS

Successor:

R 1200 GS (introduced in 2004)

Production Years:

The R 1150 GS model range was produced from 1999 to 2005. The 1998 model designation might refer to the model year of introduction or early production. (Note: 1998 may be an early model year designation, with primary production starting in 1999).

🏆 Awards & Recognition

Motorcycle Awards:

While specific awards for the 1998 model year are not readily available, the R 1150 GS series received numerous accolades and critical acclaim for its pioneering role in the adventure touring segment and its robust capabilities.

Reliability Ratings:

Generally considered reliable, especially with proper maintenance as outlined in the service manual. Known for robust engineering.

Emissions Compliance:

Meets relevant emissions standards for its production year, specific details would be in the manual or vehicle compliance plates.