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Italian Motorcycles

S4 by Sergio Secondo Motorcycles

A Brief History of the Marque

Manufactured: 1939-1954

Sergio Secondo built racing motorcycles with transverse four-cylinder OHC engines of 350 and 500cc which gained recognition in competition in the post-war years. Later machines had Earle-style forks, a 4LS front brake, swinging arm suspension with dual shock absorbers and a sculpted fuel tank. It was quite a stunning machine.

Sergio Bongiovanni is mentioned in connection with this marque.

Sources: MC Storico Conti et al



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