This comprehensive 1976 RD250(C) RD400(C) Service Repair Manual for Yamaha motorcycles offers detailed instructions and diagrams to guide you through every aspect of maintenance and repair. The manual covers a wide range of topics, ensuring you have the information needed to keep your motorcycle running smoothly. It begins with general information, including specifications and safety precautions, to set the stage for your repair journey. Next, you'll find a section dedicated to periodic inspections and adjustments, ensuring consistent performance and longevity. The manual delves into the intricacies of engine overhaul, providing step-by-step instructions for disassembling, rebuilding, and reassembling the engine. The cooling system receives dedicated attention, covering everything from troubleshooting issues to performing complete system overhauls. A comprehensive chapter on carburetors equips you with the knowledge to understand and adjust their critical role in fuel delivery. The chassis receives thorough coverage, encompassing everything from suspension and brakes to steering and frame adjustments. The manual also provides in-depth information on the electrical system, including wiring diagrams and troubleshooting guides. Finally, a detailed troubleshooting section helps you diagnose and resolve a wide range of issues, enabling you to tackle problems with confidence. This manual covers all the essential aspects of maintaining and repairing your 1976 RD250(C) or RD400(C), enabling you to keep your motorcycle in top condition.

The Yamaha RD250 and RD400, launched in 1973, were iconic two-stroke motorcycles that revolutionized the sportbike scene. These machines were renowned for their high-revving, powerful engines, lightweight frames, and sharp handling, making them popular choices for both street riding and racing. The "C" designation in the models you mentioned, RD250(C) and RD400(C), refers to the 1976 model year. These models featured several upgrades over previous years, including a redesigned fuel tank, improved suspension, and larger front disc brakes. Notably, the RD400(C) also received a significant power bump, boasting a larger bore and increased horsepower compared to its earlier counterparts. Both the RD250(C) and RD400(C) were powered by two-cylinder, air-cooled, two-stroke engines. The RD250(C) produced around 30 horsepower, while the RD400(C) delivered a respectable 42 horsepower. These engines were known for their impressive acceleration and high top speed, thanks to their lightweight design and high-revving nature. The bikes featured a five-speed gearbox and chain drive, offering smooth and responsive power delivery. The chassis was built around a sturdy steel frame with telescopic forks in the front and twin shocks in the rear, providing a balanced and agile ride. The motorcycles were also noted for their sharp handling, with a low center of gravity and precise steering. These factors made them immensely popular in racing, where they were frequently seen competing in various categories, including road racing and motocross.