The above has to be a 1911,1912 or 1913 HD twin ,the engine below went in a bike like this.
A fellow i know recently discovered this 1913 HD twin engine. This technology is before a recirculating oil pump was introduced, note also no valve covers, they surface in 1914 models.If you have one of these early engines, email me. i would like to build a racer, just go to the profile page , look for contact info...
This flat block is where the Bosch magneto was positioned.
Early Schebler carburetor, HD later adopted Linkerts. Production of singles and twins for 1913 are 12,904 motorbikes.
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