The Yamaha XS400 1979 Repair Service Manual is a comprehensive guide designed for professional technicians and skilled DIY mechanics. This manual provides detailed information for a wide range of repair and maintenance procedures for the Yamaha XS400 1979 motorcycle. It is written for individuals who possess a foundational understanding of electrical and mechanical principles. The manual walks users through essential repair and maintenance procedures step-by-step, covering topics typically found in factory service manuals and owner's manuals. This service manual equips users with the knowledge and guidance to understand the inner workings of the Yamaha XS400 1979 and confidently tackle repair and maintenance tasks. It covers a wide range of procedures, including: step-by-step repair procedures, critical specifications, detailed illustrations, maintenance routines, disassembly and assembly instructions, cleaning processes, reinstallation procedures, and much more. This manual serves as a valuable resource for anyone seeking to maintain and repair their Yamaha XS400 1979 motorcycle.

The Yamaha XS400, introduced in 1977, was a versatile and popular motorcycle that captured the hearts of riders seeking a smooth and reliable ride. This air-cooled, four-stroke, parallel-twin engine motorcycle boasted a displacement of 399cc, producing a respectable 39 horsepower. The XS400 offered a comfortable riding position, making it ideal for both commuting and weekend adventures. It was renowned for its ease of handling, thanks to its relatively lightweight design and responsive suspension. The simplicity of its design also made it an attractive choice for novice riders, making it an excellent entry point into the world of motorcycling.

The 1979 XS400, the subject of this repair service manual, represents a refinement of the original model. It featured improved styling, with a more angular tank and a redesigned seat, as well as minor mechanical enhancements. These upgrades aimed to enhance the riding experience while maintaining the bike's inherent reliability and ease of use. The XS400 became a staple of the 1970s and 1980s motorcycle scene, earning a reputation for its durability and simple maintenance. Its popularity stemmed from its combination of affordability, performance, and reliability, making it a compelling choice for riders of all skill levels. The repair service manual provides invaluable guidance for owners to maintain and repair their XS400, ensuring that this classic motorcycle continues to provide years of enjoyable riding.