The RD50 was the smallest capacity road sports machine. It starts with the FX50 of May '72 (above left), followed by the RD50 of Jan '74. The later 2 models had the same styling as the larger street bikes. The YA6 of April '64 looked very much like a larger version of the YG1. 16 inch wheels and a strong rotary valve engien. This bike became the A7 ( Oct. '68) and then the YB125 series. Starting in Feb. '73 the first model still had a pressed steel frame, from Oct. '76 (4) the machine had a stiff duplex cradle frame, with a seven-port 12 hp engine.

p81 Yamaha YA6, Apr. '64