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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. 1/61 (179) July 27th, 1961

No. 2/62 (184) April 5th, 1962