Market Segment:
Sport Touring / Naked Sport Motorcycle
Key Competitors:
Honda CB-1, Yamaha FZR600, Kawasaki GPX600R, Suzuki GSX-R600
Platform Strength:
BMW's innovative inline-triple engine, shaft drive, solid build quality, and distinctive design
Manual Benefit:
Empowers owners and independent mechanics to perform all necessary repairs and maintenance, significantly reducing dealership costs and downtime.
Powertrain:
Engine disassembly, assembly, troubleshooting, cooling system, lubrication system, fuel system, ignition system, exhaust system
Chassis:
Frame, front suspension (forks), rear suspension (Monolever swingarm, shock absorber), steering system
Brakes:
Front and rear brake system service, hydraulic components, disc and caliper maintenance, bleeding procedures
Electrical System:
Wiring diagrams, lighting, ignition system components, battery, charging system, starter motor, electronic control units (ECUs), instrumentation
Fuel And Emission Control:
Fuel injection system (Bosch Motronic), fuel pump, injectors, throttle body, emission control systems (if applicable to specific markets)
Bodywork And Fittings:
Fairings, body panels, seats, fuel tank, storage compartments, instrument cluster, mirrors, controls
Maintenance:
Oil changes, filter replacements, spark plug service, valve clearance adjustment, chain adjustment (if applicable to specific models/drives), brake fluid changes, coolant replacement
Troubleshooting:
Diagnostic procedures for common and uncommon issues across all major systems, fault code interpretation (if applicable to early EFI systems)
Repair:
Detailed step-by-step instructions for component removal, repair, and reinstallation
Rebuild Refurbish:
Engine top-end and bottom-end rebuild procedures, gearbox overhaul, suspension component refurbishment
Depth Of Information:
Comprehensive from basic owner-level maintenance to advanced engine-out procedures and electrical system diagnostics
Engine Type:
Inline-three cylinder, four-stroke
Displacement:
740 cc (737cc)
Bore X Stroke:
70 mm x 64 mm
Compression Ratio:
10.0:1 (typical, may vary slightly by sub-model)
Valve Train:
DOHC, 2 valves per cylinder
Cooling System:
Liquid-cooled
Horsepower:
Approx. 75 HP @ 8500 RPM (K75S), ~65 HP (K75 standard)
Torque:
Approx. 70 Nm @ 6500 RPM
Fuel Delivery:
Bosch Motronic electronic fuel injection
Fuel Type:
Unleaded gasoline (95 RON recommended)
Oil Type And Capacity:
SAE 20W-40 or 20W-50, Capacity: Approx. 4.0 liters (with filter change)
Ignition Type:
Electronic ignition (Motronic)
Length:
Approx. 2150-2200 mm (varies by model)
Width:
Approx. 750-850 mm (including mirrors)
Height:
Approx. 1150-1250 mm (seat height varies)
Dry Weight:
Approx. 190-210 kg (varies by model)
Gross Vehicle Weight Rating:
Approx. 400 kg
Fuel Capacity:
18-21 liters (including reserve), varies by model (e.g., K75T had larger tank)
Front Tire Size:
110/80-18
Rear Tire Size:
130/90-17 (or 140/80-17 on some variants)
Wheel Bolt Pattern:
N/A (Cast alloy wheels with specific hub mounting)
Safety Standards:
Designed to meet relevant European and international motorcycle safety standards of its era.
Braking System:
Dual front disc brakes with twin-piston calipers, single rear disc brake with twin-piston caliper. Optional ABS (Anti-lock Braking System) available on some models (e.g., K75S/K75RT derived).
Frame Construction:
Steel diamond frame providing rigidity and rider protection.
Instrumentation:
Analog speedometer, tachometer, fuel gauge, engine temperature gauge, odometer, trip meter, various indicator lights (oil pressure, neutral, turn signals, etc.). Some models may have basic LCD displays for mileage/time.
ABS:
Optional ABS system available on certain models, requiring specific maintenance procedures covered in the manual.
Electrical Management:
Bosch Motronic engine management system controlling fuel injection and ignition timing, providing robust performance and efficiency for its era.
Oil Change Interval:
Every 5,000 - 10,000 km or annually, whichever comes first (refer to manual for exact specification).
Valve Clearance Check:
Every 10,000 - 20,000 km, depending on wear and manual recommendations.
Spark Plug Replacement:
Every 10,000 - 20,000 km, depending on plug type and condition.
Brake Fluid Change:
Every 2 years, regardless of mileage, due to hygroscopic nature.
Coolant Type:
Ethylene glycol-based coolant (e.g., BMW approved coolant or equivalent) mixed with distilled water (50/50).
Brake Fluid Type:
DOT 4 brake fluid.
Common Wear Items:
Fuel pump relay failures, stator failures, voltage regulator issues, aging rubber components (hoses, seals), swingarm pivot bearings, clutch slave cylinder seals.
Potential Problems:
K-series specific vibration issues at certain RPM ranges (often addressed by balancing or minor tuning), ignition coil pack degradation over time.
Bmw Motorrad Legacy:
BMW Motorrad's long history of engineering excellence, particularly in boxer engine motorcycles, transitioned to the K-series with a focus on inline multi-cylinder engines for performance and refinement.
K Series Introduction:
The K75 was part of BMW's revolutionary K-series, introduced in the mid-1980s, featuring an inline-three cylinder engine as a more compact and lighter alternative to the larger K100's inline-four. The K75 offered a blend of performance, comfort, and BMW's signature shaft drive.
Manufacturing Location:
Berlin, Germany (Spandau Plant)
Sub Model Differentiation
K75C:
Standard model, often with a smaller fairing or no fairing.
K75S:
Sportier variant with improved suspension (e.g., better forks, adjustable rear shock) and a more aerodynamic fairing, higher compression for more power.
K75T:
Touring variant, typically featuring a larger fuel tank and a more substantial fairing for increased comfort on longer journeys.
