Market Position:
The K1100 LT and RS were BMW's flagship touring and sport-touring motorcycles of their era, known for their robust inline-four engines, comfortable ergonomics (LT), and sophisticated engineering.
Competitive Analysis:
Competed with other premium sport-touring and touring motorcycles from manufacturers like Honda (ST series), Yamaha (FJ series), Kawasaki (GTR series), and to some extent, early touring models from Harley-Davidson and Moto Guzzi.
Key Features:
Inline-four cylinder engine, shaft drive, robust chassis, ABS braking system (optional/standard), advanced fuel injection, high-quality build, comfortable touring capabilities (LT).
Engine Systems:
Engine overhaul, cylinder head, valve train, fuel injection (Bosch Motronic), ignition system, lubrication system, cooling system (liquid-cooled), exhaust system
Transmission Drivetrain:
Gearbox (5-speed), clutch (dry single plate, later wet multi-plate), final drive (shaft drive), driveshaft maintenance
Chassis Suspension Brakes:
Frame, front fork (tele-telescopic), rear monoshock suspension, braking system (ABS II optional/standard depending on model variant), wheel bearings, steering system
Electrical Systems:
Wiring diagrams, battery, charging system (alternator, regulator), starter motor, lighting (headlight, taillight, indicators), instrumentation, ABS II system wiring, fuel pump, fan control
Bodywork Trim:
Fairings (LT touring fairing, RS sport fairing), seat, fuel tank, body panels, luggage systems (LT model), mirrors
Maintenance Procedures:
Oil changes, filter replacement, spark plug service, brake fluid flush, coolant service, air filter cleaning/replacement, chain adjustment (if applicable, though shaft drive), tire pressure checks, valve clearance checks
Repair Procedures:
Engine rebuilds, transmission disassembly/assembly, clutch replacement, fork seal replacement, shock absorber servicing, brake caliper rebuild, ABS system troubleshooting, fuel injector testing, electrical component diagnosis
Troubleshooting Guides:
Diagnostic flowcharts for common starting, running, and electrical issues, error code interpretation (if applicable to Motronic system)
Technical Depth:
Comprehensive: Covers routine maintenance to complete engine and gearbox rebuilds, including detailed diagnostic procedures and specifications.
Engine Type:
Four-stroke, inline four-cylinder
Displacement:
1093 cc (1.1 Liters)
Bore X Stroke:
72 mm x 67.5 mm
Compression Ratio:
10.0:1 (typical)
Valve Train:
DOHC, 4 valves per cylinder
Horsepower:
100 hp @ 7500 rpm (approximate)
Torque:
101 Nm (74.5 lb-ft) @ 6000 rpm (approximate)
Fuel Injection:
Bosch Motronic electronic fuel injection with digital engine management
Fuel Type:
Unleaded gasoline (95 RON recommended)
Length:
LT: ~2280 mm (90 in); RS: ~2220 mm (87 in) (approximate, varies by fairing)
Width:
LT: ~900 mm (35 in); RS: ~800 mm (31 in) (approximate)
Height:
LT: ~1400 mm (55 in); RS: ~1250 mm (49 in) (approximate, varies by windshield)
Dry Weight:
LT: ~277 kg (611 lbs); RS: ~250 kg (551 lbs) (approximate)
Gross Vehicle Weight Rating:
Approximately 480 kg (1058 lbs) (check manual for exact rating)
Luggage Capacity:
LT: Integrated panniers and top case; RS: Minimal integrated storage.
Safety Features:
ABS II Anti-lock Braking System (optional on early models, standard on later ones), comprehensive lighting, stable chassis.
Active Safety:
ABS II, responsive braking, predictable handling.
Passive Safety:
Sturdy frame, rider protection via fairings (especially LT).
Infotainment Features:
Primarily focused on functionality; LT models often featured integrated radio/cassette players (later models might have aftermarket upgrades).
Driver Assistance Systems:
ABS II Anti-lock Braking System.
Connectivity Features:
Basic electrical systems; no modern smartphone integration or advanced connectivity.
Oil Change Interval:
Every 10,000 km (6,000 miles) or annually, whichever comes first.
Major Service Interval:
Every 20,000 km (12,000 miles) for valve checks, fuel system inspection, etc.
Engine Oil Type:
SAE 20W-40 or 15W-50 motorcycle-specific oil meeting BMW specifications (e.g., API SG/SH or higher).
Engine Oil Capacity:
Approximately 4.5 liters (4.8 US quarts) with filter change.
Coolant Type:
BMW approved ethylene glycol-based coolant (e.g., BMW Coolant 81 22 9 407 094 or equivalent).
Brake Fluid Type:
DOT 4 or DOT 5.1 brake fluid.
Final Drive Oil Type:
SAE 90 Hypoid gear oil.
Common Issues:
Stretched timing chains (though less common than on earlier K-series), fuel pump issues, electrical connector corrosion, aging rubber components (hoses, seals), ABS sensor wear.
Preventative Maintenance:
Regular fluid changes, inspecting electrical connections, checking fuel lines, and maintaining the ABS system are crucial for longevity.
Brand Heritage:
BMW Motorrad has a long history of producing reliable, technologically advanced, and durable motorcycles, particularly in the touring and sport-touring segments.
Model Evolution:
The K1100 series was an evolution of the K100 series, featuring an enlarged engine (from 987cc to 1093cc) and updated styling and features for improved performance and touring comfort. The LT variant focused on long-distance touring with a full fairing and luggage, while the RS offered a sportier profile.
Production Period:
Approximately 1992-1999.
Manufacturing Locations:
Berlin, Germany (BMW Motorrad plant)
Market Reputation:
Highly regarded for build quality, reliability, and touring capability. Often praised for its smooth engine and stable ride.
Ownership Reviews:
Generally positive, with owners appreciating the longevity and capability, though maintenance can be more complex than simpler machines.
