This manual covers the R5C, a classic Japanese sportbike produced in 1972 and 1973. Known for its sporty performance and handling, the R5C features a 347 cc two-stroke parallel-twin engine, dual Mikuni carburetors, and a 5-speed transmission. It represents an evolution of parallel-twin offerings from the early 1970s, competing with other performance motorcycles of its era. The R5C is recognized for its spirited acceleration and agile chassis, making it a sought-after model for enthusiasts. This workshop service repair manual provides comprehensive guidance for maintaining and repairing the R5C. It details engine mechanicals, fuel and ignition systems, transmission, chassis, suspension, brakes, and electrical systems. The manual includes procedures for routine maintenance, troubleshooting common issues, and full rebuilds of major components. With factory-level detail, this English-language manual is an essential resource for owners, mechanics, and technicians aiming to preserve the performance and reliability of their R5C.