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Wiring diagram BMW R51/3 – R68 (1953 – 1955) with brake light          

Wheel offset for R51/2 – R68, R50 – R69S models (from “1000 Tricks für Schnelle BMW’s”)                

Overview of  BMW motorcycle models produced from 1948 to 1969 (specials not included) Click for larger image: Models & Production Numbers  

Overview of the different valve types and related components, used in the BMW 1 and 2-cylinder motorcycles 1948 – 1969

Overview of fuel cock types for 1 and 2-cylinders

Overview of ISO metric screw threads M3 – M30. Commonly used screw threads on 1948 – 1969 BMW models are M6x1 coarse, M8x1.25 coarse and M8x1.0 fine.   The length of bolts and screws is measured like this:                

Overview of carburetor nr’s and settings  

A visual inspection of the spark plugs can serve as a good indicator of the condition and tuning of the engine. This Bosch sheet may help to identify the possible cause in case of trouble. (click to enlarge)

Guidelines for correct installation of (Bosch) spark plugs  

The photos are a compilation of the work done on different crankshafts: R67/2, R60/2 and R69S.                                                                    

No. 1/57, 1957