A guide to building a replica of an early 1970s Yamaha production racing motorcycle (the TD or TR) from an RS-series Yamaha (specifically any of the following variants: RS100D; RS100DX (also known as the RX100); RX-S (and RX-Special); the Escort-built variants, and similar variants in other capacities, such as the RX115. Somewhat useful if using an RS100A, B, or C, or the RX-Z as a basis). Includes a brief history of the Yamaha RS series motorcycles, with the part number prefix codes (e.g., 31J for the RX-S).