(1981 / Production Model)
This model was a further development of the XJ400 launched the previous year as Yamaha's first 400cc class model with a 4-stroke, DOHC, 4-cylinder engine. Its engine had Yamaha's signature slim, compact design and adopted YICS (Yamaha Induction Control System) to achieve a maximum output of 45PS and a boost in fuel economy of more than 20%. Furthermore, it featured improved low- to mid-speed torque, front forks with pneumatic and coil spring cushioning, rear suspension with two adjustable dampers, a 4-pipe muffler and more to achieve even more outstanding running performance and polished styling.
- Overall length × width × height: 2,060mm × 760mm × 1,130mm
- Weight: 180kg
- Engine type: Air-cooled, 4-stroke, DOHC, 2-valve, in-line 4-cylinder, 398cm³
- Maximum power output: 33.1kw(45.0PS) / 10,000r/min
- Maximum torque: 34.3N･m (3.5kgf･m) / 8,000r/min
- Price: ¥452,000
*All figures, etc. in a model's description or specifications are from when the model was originally released.