Yamaha started perfecting the two-stroke motorcycle in 1955 with the debut of their first motorcycle, the YA-1. By 1963 the small Japanese motorcycle manufacturer had grown to become a competitive Isle of Man TT race team and an internationally recognized brand known for their small but powerful two-stroke motorcycles. In 1964, building on the success of their 250-cc two-stroke engine, Yamaha released the upgraded YDS3. The YDS3 was the first Yamaha to offer the autolube system, a gearbox driven self-oiling system, as well as improved cylinder heads, an extra clutch plate, larger diameter 24mm carbs, and a stronger crankshaft and engine seals.

The YDS3 on offer has benefited from a repaint at some point in its history and shows nicely but will require some work to make it road worthy again. These are known as a strong and reliable two-stroke engine and with little recommissioning would make a great touring motorcycle or café racer.