(1971 / Production Model)
The HX90 mounted the final iteration of the AT90’s power unit, which was marketed as the world’s first 2-stroke 90cc parallel twin when it was first released in 1965. Its high-pitched exhaust note under acceleration made it popularly known as the “Jet Twin” and the bike’s styling was modern as well, taking after the 2-stroke RX350 of the time. The HX90 was produced until 1974—when the single-cylinder RD90 was released—and its pleated seat and semi-upright handlebars provided a comfortable riding position, while it came with a bigger taillight, side reflectors, and more.
- Overall length × width × height: 1,860mm × 750mm × 1,000mm
- Weight: 95kg
- Engine type: Air-cooled, 2-stroke, in-line 2-cylinder, 89cm³
- Maximum power output: 7.72kW (10.5PS) / 8,000r/min
- Maximum torque: 9.41N･m (0.96kgf･m) / 7,500r/min
- Price: ¥98,000
*All figures, etc. in a model's description or specifications are from when the model was originally released.