Introduced for the 1985 model year, this was Yamaha’s answer to riders who wanted a big single with a more contemporary, minimalist character than the company’s better-known SR series. It arrived as a lightweight, slim, and compact road bike built around an air-cooled four-stroke single, and Yamaha positioned it as a distinctly different kind of sport model at a time when replica-style performance motorcycles were dominating the market. The design emphasized exposed metalwork, clean surfaces, and a compact silhouette, giving it a refined industrial look that set it apart from more conventional singles of the era.
The model was offered in both 600 and 400 forms, and it became known among enthusiasts for its straightforward mechanical layout and purposeful styling rather than outright complexity. In Yamaha’s own historical materials, it is treated as part of the company’s 1980s push to create motorcycles that balanced performance, individuality, and visual simplicity. The larger version also earned a reputation as the more focused expression of the concept, while the smaller sibling broadened the appeal of the line.
Because this nameplate did not have a clearly documented, universally agreed final model year in the sources reviewed, the end of production is left unverified here.