1906 F.N. Light Four Back to contest Vote Description 1906 F.N. Light Four Built by Fabrique Nationale, this was the world's first practical four-cylinder motorcycle, making 3 hp from the 410cc engine. Production ended in WWI, when German forces occupied the factory. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Δ Share OK More