This workshop service manual provides comprehensive guidance for the motorcycle, model designation KZ450-D, covering production years 1985 through 1990. Engineered as a mid-size cruiser, the LTD 450 features a responsive 450cc DOHC parallel-twin engine, combining comfortable styling with capable performance. Its design philosophy centers on delivering a versatile riding experience, making it a reliable choice for both cruising and daily commuting. The robust construction and parallel-twin configuration contribute to its enduring appeal and ease of maintenance. This manual serves as an essential resource for mechanical technicians and experienced DIY enthusiasts. It details a wide range of maintenance procedures, from routine oil changes and adjustments to complex engine and transmission overhauls. The scope includes in-depth coverage of the engine, fuel system, ignition, lubrication, electrical systems, bodywork, and transmission. Furthermore, it provides crucial troubleshooting guides, diagnostic procedures, and technical specifications, including torque values and fluid requirements, enabling owners and mechanics to effectively maintain and repair their LTD 450 with precision and confidence.