This service repair manual covers the Yamaha Ovation 340 snowmobile, including model variants CS340 and CS340E, produced between 1989 and 1999. Engineered with a 337cc two-stroke engine, the Ovation series was designed for recreational trail riding, embodying Yamaha's reputation for reliable performance and comfortable handling. This manual provides comprehensive information to maintain, restore, and repair these vehicles, empowering owners and technicians with factory-level details. The scope of this manual is extensive, encompassing detailed procedures for engine repair, transmission service, fuel system maintenance, electrical system diagnostics, and much more. It includes step-by-step instructions, troubleshooting guides, and clear illustrations to facilitate effective maintenance and repair. This resource is intended for professional technicians, mechanics, workshops, and DIY enthusiasts seeking to ensure the longevity and optimal performance of their Yamaha Ovation 340 snowmobile.