This comprehensive Yamaha XS400 1990 Service and Repair Manual provides a wealth of information to help you maintain and repair your motorcycle. It covers all aspects of the XS400, from basic maintenance to complex engine overhauls.

The manual includes detailed information on general information, specifications, periodic checks, engine overhaul, chassis, carburetion, electrical systems, and appendices. With this manual, you can confidently tackle any repair or maintenance task, ensuring your Yamaha XS400 runs smoothly and reliably for years to come. Its detailed instructions and clear illustrations make it easy to understand even the most complex procedures. This manual is an invaluable resource for any owner of a 1990 Yamaha XS400.

The Yamaha XS400, produced from 1979 to 1981, was a popular and well-regarded motorcycle that embodied the Japanese manufacturer's commitment to reliable and affordable transportation. It featured a 400cc air-cooled, parallel-twin engine, known for its smooth power delivery and easy handling. This engine, paired with a five-speed transmission, provided ample power for commuting, touring, or just enjoying a leisurely ride. The XS400 was designed with a focus on simplicity and durability, making it an excellent choice for riders seeking a low-maintenance and easy-to-work-on machine. Its sleek, classic design, featuring a distinctive teardrop fuel tank and chrome-plated elements, appealed to a wide range of riders, from beginners to experienced enthusiasts.

While the Yamaha XS400 was discontinued in 1981, its legacy continued through the introduction of the XS400 Special in 1982. This version featured minor cosmetic and mechanical upgrades, including a more modern color scheme and a redesigned airbox. The XS400 remained a popular choice among riders for its combination of performance, reliability, and affordability. However, it's important to note that the "Yamaha XS400 1990 Digital Service Repair Manual" mentioned in your prompt is unlikely to be accurate. The XS400 model was discontinued in 1982, and a repair manual specifically for the 1990 model year would not exist.