BMW R 60/6 / R 75/6 / R 90/6 Factory Service Manual (P/N N 600 02.0, P/N N 113 49.0)

• Covers 1970s BMW R 60/6, R 75/6, R 90/6, and R 90 S motorcycles equipped with the /6 series boxer engines
• Official 186-page BMW factory publication featuring technical data, torque specifications, and service sequences
• Contains 47 detailed technical data tables for engine, electrical, and fuel systems, alongside 8 exploded-view-style assembly references
• High-resolution scans maintain clear visibility for part identification, clearances, and tight tolerances
• Foundational reference for /6 series Boxer engine overhauls, detailing the specific setup for the R 90 S high-performance variant
• Covers essential drivetrain and chassis assemblies: transmission, clutch, drive shaft, front fork, steering, rear axle, brakes, and frame
• Details auxiliary systems and electrical components: general electrics, instruments, lights, pedal assembly, wheels, tyres, fuel tank, lines, and dual seat

Engine and Fuel System Documentation

Working on classic horizontally opposed 2-cylinder Boxer engines requires exact factory data to avoid costly mistakes. Available as a clear PDF (reference file 000001.pdf), this document delivers comprehensive specifications covering the full range of /6 displacements, from the 595 cc R 60/6 right up to the 898 cc R 90 S. Mechanics will find the step-by-step instructions for complex tasks—such as cylinder head dismantling and valve grinding, timing chain gear train renewing, alternator overhauling, and complete gearbox removing and refitting—invaluable for bench work, effectively saving an expensive trip to a specialized repair shop. It provides the exact tolerances needed for crankshaft main bearing journals, connecting rod clearances, and precise piston ring sizing. Because vintage motorcycle maintenance carries inherent physical risks, referencing these official factory parameters is crucial for maintaining mechanical integrity and safe operation. Further sections break down the fuel system. Readers get complete carburetor settings for the various Bing and Dellorto setups utilized across the model lineup, alongside essential troubleshooting guides like the starter and alternator fault finding charts. Access to authentic factory data ensures correct clearances, preventing the common issue of mismatched aftermarket tolerances and guaranteeing true restoration quality.

Specification Highlights

Having precise torque values speeds up the workflow in any garage. The manual includes extensive tightening torques and preload forces tables for all critical engine fasteners, conforming to Standard Specification 60 002.0, clearly listing required values in both mkp and ft-lbs. For instance, cylinder head bolt torque values follow a strict multi-stage sequence to ensure proper seating for the overhead valve configuration. The electrical section maps out the Bosch alternator and starter system, providing essential resistance values for coils alongside diode testing parameters and complete wiring diagrams. Visual support is extensive, featuring visual compression indicator graphs, piston fitting clearance charts, valve timing settings charts, and gearbox transmission ratio tables. Digging into the specifics, intake valve clearance is stated at 0.15 mm. Engine oil capacity registers at 2.0 liters without a filter change, while the R 90 S starter output is rated at 0.5 HP. This comprehensive data makes tackling chassis, engine, or electrical service on the /6 series highly predictable.