1. According to official website. Com, the engine difference is that Feng Chun 450sr is equipped with a single-cylinder water-cooled engine, while Feng Chun 450srs is equipped with a double-cylinder water-cooled engine.
2. Power difference: The maximum power and torque of Chunfeng 450sr are 37 kW and 43 Nm respectively, and the maximum power and torque of Chunfeng 450 Sr are 34 kW and 3 1 Nm respectively.