1941-1946 BMW R75 Motorcycle Service Manual

Technical Scope for the 1973–1976 BMW R-Series

• Covers the 1973–1976 BMW R 60/6, R 75/6, R 90/6, and R 90 S motorcycles, detailing engine, electrical, and fuel system specifications
• Original OEM publication, form number 01 99 9 099 421
• Contains 50 pages of technical data, engine overhaul procedures, electrical wiring system diagnostics, and fuel supply maintenance
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• Indexed PDF search covers every chapter and appendix
• Full-text search finds any part number in seconds
• This 1973–1976 BMW R-series workshop document is the definitive factory reference for servicing the /6 boxer engine series, incorporating all performance data and tightening specifications for the R 60/6 through R 90 S.

Engine and Fuel System Documentation

The 1973–1976 BMW R 60/6 and related R-series motorcycles manual covers engine removal, cylinder head servicing, and crankcase internals in dedicated sections. The engine documentation details tolerance charts for piston and ring clearances, crankshaft bearing stages, and valve timing. Fuel system what an OEM service publication covers includes tuning the Bing constant depression carburetors for the R 75/6 and Dellorto units on the R 90 S, alongside float level checking and air filter maintenance.

Specification Highlights and Electrical Data

Electrical system chapters document starter motor testing, alternator output, and contact breaker timing. This 1973–1976 BMW R 90/6 publication provides tightening torque values for all main engine fasteners, including cylinder head studs and connecting rod bolts. Cylinder head stud torque is documented in a three-stage sequence from 3.5 to 3.9 mkp (25.3–28.2 ft/lb). The main bearing journal radial clearance is specified at 0.035–0.065 mm (0.0013–0.0025 inches) in the technical section. Starter motor short circuit current strength is listed at 290 amps. All technical data in this 1973–1976 BMW R 60/6 factory manual serves as the authoritative source for professional maintenance and engine restoration of the classic /6 boxer motorcycles.