(1970 / Production Model)
After making only 2-stroke models since its founding in 1955, Yamaha Motor introduced this model as its first to mount a 4-stroke engine. At a time when Japan was beginning to expand its system of expressways and there was a growing demand for larger, faster motorcycles worldwide, the development task of building a “lightweight, slim and compact big-displacement sports model” was achieved by mounting a vertical OHC twin cylinder engine with a slim design on an equally slim double cradle frame. This model won many fans who called it by the nickname "Peke-S."
- Overall length × width × height: 2,175mm × 905mm × 1,155mm
- Weight: 185kg
- Engine type: Air-cooled, 4-stroke, OHC, 2-valve, in-line 2-cylinder, 653cm³
- Maximum power output: 39.0kW (53.0PS) / 7,000r/min
- Maximum torque: 53.9N･m (5.5kgf･m) / 6,000r/min
- Price: ¥338,000
*All figures, etc. in a model's description or specifications are from when the model was originally released.