Yamaha first raced in Europe in 1961, entering Naito’s new RD48 250 rotary-valve twin and the YX-derived RA41 125 single. Power was 35 hp for the 250 and 20 for the 125. Photos show that both bikes were built on a single top-tube/double-downtube swingarm chassis that is familiar to us because of its later use in the TD1-A, B, C series of 250 production racers. It also bore the signature red “watermelon” fuel tank of that time, emblazoned with the crossed-tuning-forks logo symbolizing the company’s origin in the musical instrument business. Bikes of this era seem tiny to us, accustomed as we are to the 1-liter behemoths of the present, whose engines have four times the displacement and six to seven times the power. Wheelbase was 50.4 inches!