The Ducati 350SS, Ducati 400SS and Ducati 600SS were Ducati sport bike motorcycles made from 1989 through 1999 for the Japanese and Italian markets.
The 350/400 SS models were produced to meet regulations under the prevailing driving license schemes for Japan (400 cc) and Italy (350 cc), where there were limits on maximum displacement allowed for probationary motorcyclists. The 600SS was introduced in 1994 as a midrange competitor for a growing market, and to provide a cheap way to spread the Ducati range. Visually, they are only slightly different from the other SS models.
Also known as the 400SS Junior, the models were based on the larger 750SS with which they shared a frame, engine and most other components. The most obvious differences were the 2-into-1 exhaust system on some versions (also used the 600) and the single-disc brake system. The 600SS having a five ratio transmission instead of the six gears on the 350 and 400. The smaller engine capacity was achieved by sleeving down the larger 750SS engine. The models were available semi-faired or with a full fairing. As with the Ducati 750SS and 900SS, vents were provided in the cowl in the 1997 model to provide additional air to the rear cylinder, which was prone to overheating.