Segment:
Mid-size sport-touring and standard motorcycle segment.
Price Point:
Positioned as BMW's most affordable motorcycle at its introduction, offering value within the premium brand.
Competitors:
Competed against Japanese inline-four and V-twin motorcycles in the 600-800cc class from manufacturers like Honda, Yamaha, Kawasaki, and Suzuki.
Engine Layout:
Unique longitudinal inline-three-cylinder engine configuration for a lower center of gravity and efficient shaft drive.
Fuel Injection:
Early adoption of Bosch electronic fuel injection for improved performance, fuel economy, and emissions.
Shaft Drive:
Low-maintenance, clean shaft-driven final drive, a signature BMW feature.
Model Diversity:
Offered in various configurations (K75, K75T, K75C, K75S, K75RT) to cater to different rider preferences and touring needs.
Applicable Years:
1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995
Estimated Pages:
Refer to actual manual for precise count (typically 300-500+ pages for comprehensive FSMs)
Type:
Factory Service Manual (FSM)
Format:
Likely PDF (digital) or printed book
Engine Overhaul:
Complete disassembly, inspection, repair, and reassembly of the 740cc inline-three engine.
Fuel System:
Bosch fuel injection system (EFI) diagnosis, component testing, servicing, and calibration.
Transmission And Clutch:
Servicing and repair of the five-speed transmission and dry clutch assembly.
Final Drive:
Maintenance and repair of the shaft-driven final drive system, including driveshaft and bevel gear.
Suspension Front:
Detailed procedures for servicing and repair of the telescopic front forks, including anti-dive systems (on S/RT models).
Suspension Rear:
Maintenance and repair of the rear suspension, including shock absorber and swingarm.
Braking System:
Service and repair of front and rear braking systems, including disc brakes (S/RT) and leading-shoe drum brake (K75/T/C), hydraulic components, and bleeding procedures.
Electrical System:
Comprehensive coverage of the motorcycle's electrical system, including battery, charging system, ignition, lighting, instrumentation, and wiring diagrams.
Chassis And Frame:
Frame inspection, component mounting, and general chassis maintenance.
Bodywork And Fairings:
Removal, installation, and repair of body panels, fairings (K75C, K75S, K75RT), windscreen, and saddlebags.
Cooling System:
Maintenance and service of the liquid-cooled engine's cooling system, including radiator, coolant, and fan.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, chain adjustment (if applicable, though this has shaft drive), tire pressure checks, brake fluid checks.
Troubleshooting:
Diagnostic procedures for common and uncommon issues across all major systems, with symptom-based troubleshooting guides.
Engine Repair:
Detailed step-by-step instructions for engine disassembly, component replacement (e.g., pistons, rings, valves), and reassembly with torque specifications.
Fuel Injection Diagnosis:
Specific procedures for diagnosing and repairing the Bosch fuel injection system, including sensor checks and injector servicing.
Brake System Overhaul:
Bleeding brakes, replacing brake pads and discs/drums, caliper service, and master cylinder inspection.
Electrical Diagnostics:
Using wiring diagrams for fault finding, testing electrical components, and repairing wiring harnesses.
Suspension Rebuild:
Fork seal replacement, oil changes, spring inspection, and shock absorber servicing.
Wheel And Tire Service:
Tire replacement, wheel balancing, and checking wheel bearings.
Torque Specifications:
Crucial torque values for all fasteners during assembly and disassembly of engine, chassis, and component parts.
Depth:
Comprehensive, covering everything from basic rider maintenance to complete engine and transmission rebuilds.
Diagnostic Capability:
Advanced diagnostic procedures for electronic and mechanical systems, including fuel injection and ignition.
Special Tools:
Identification and usage of specialized tools required for BMW K-series motorcycles.
Engine Type:
Liquid-cooled, four-stroke, inline three-cylinder
Displacement:
740 cc (740cc)
Bore X Stroke:
Typically 70 mm x 64 mm (verify with specific manual for exact figures)
Compression Ratio:
Typically 9.0:1 or 9.5:1 (verify with specific manual)
Horsepower Usdm:
68 hp (51 kW) @ 8,500 rpm (US EPA specific)
Horsepower Row:
75 hp (56 kW) @ 8,500 rpm (Rest of World)
Torque Usdm:
Approx. 58 lb-ft (79 Nm) @ 6,500 rpm (USDM, estimate)
Torque Row:
Approx. 64 lb-ft (87 Nm) @ 6,500 rpm (ROW, estimate)
Acceleration 0 60 Mph:
4.6 seconds (claimed)
Top Speed:
120 mph (193 km/h)
System:
Bosch LE-Jetronic or Motronic electronic fuel injection (EFI)
Fuel Type:
Unleaded gasoline
Oil Change Interval:
Typically every 5,000-10,000 km or annually, whichever comes first (consult manual for exact recommendation).
Valve Clearance Check:
Usually around 10,000-20,000 km, a critical check for inline-four engines but also important for inline-threes.
Brake Fluid Flush:
Recommended every 2 years regardless of mileage to maintain braking performance and prevent corrosion.
Engine Oil:
Typically a 10W-40 or 20W-50 motorcycle-specific oil, meeting API SG or higher specifications (consult manual for exact BMW approval).
Coolant:
Ethylene glycol-based coolant with corrosion inhibitors, typically a 50/50 mix with distilled water.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (consult manual for specific recommendation).
Fuel Injector Seals:
Potential for fuel leaks from injector seals over time, requiring replacement.
Fuel Pump Reliability:
Early fuel pump designs could be prone to failure, though later models and replacements improved.
Rear Drum Brake Wear:
Models with rear drum brakes may require more frequent adjustment and inspection than disc brake equivalents.
Wind Buffeting S Model:
Some riders experience wind buffeting with the K75S model's stock windscreen, potentially necessitating an aftermarket solution.
Ignition Coil Failures:
As with many motorcycles of this era, ignition coils can become a point of failure over time.
