The Yamaha MT-OS is a sport-touring motorcycle manufactured by Yamaha Motor Corporation. It is powered by a 998cc, liquid-cooled, four-cylinder engine, and has a four-valve cylinder head. The MT-OS is available in a variety of configurations, including solo and two-up seating, with either a manual or automatic transmission. It features a comfortable riding position and a variety of features, including a smooth, powerful engine, adjustable settings, and advanced systems and components.