This model was the 250cc version of the sport model RX350
released in April of the same year. Its newly designed 2-cylinder engine
featured a 5-port layout, "Autolube" oil supply system and twin carburetors,
and was mounted on a double cradle type frame made of high-tensile steel as
on Yamaha's production racers. The un-sprung components included a Ceriani
type front fork with an aluminum bottom case, a 3-way adjustable rear
cushioning unit and completely dust- and water-proof drum brakes. It
achieved light and agile handling that set a new standard for sport bikes of
the time.
Any corrections or more information on these motorcycles will be kindly appreciated.