Yamaha XS 650

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Beschreibung

High Quality Content by WIKIPEDIA articles! The beginnings of Yamaha XS650 reach all the way back to 1955 and the HOSK SOHC 500 twin. After about 10 years of producing 500 twin, HOSK engineers went on and designed 650cc twin. Later the HOSK was acquired by Showa Corporation, and in 1960 Yamaha had bought Showa with HOSKs early design of 650cc twin. When the Yamaha XS 650 was launched in 1968 it had one of the most advanced engines in its class of large parallel twin motorcycles. The engine and gearbox are unit construction with the crankcase split horizontally for ease of assembly whereas almost all contemporaries in its class in 1968 are either unit construction with a vertically-split crankcase or pre-unit construction with separate engine and gearbox.The XS650s engine was used in AMA Professional Dirt Track Racing by national champ Kenny Roberts, which has given Yamaha twice that number one plate. In 1968 only the Laverda 750S, also launched that year, matched the XS 650's modernity of unit construction and SOHC valve operation.