Harley entered the market in 1926 with a 350cc 1 cylinder. Of this, a OHV was soon also made for sport and racing. The rare factory racers had a block with S number. The normal OHVs had AA: OHV with magnetto, BA: OHV generator, BAF with dual exhaust and the factory racer had engine number S.

Very nice restoration of a rare American Harley racer.