No, it is not true that Ducati motorcycles are built entirely out of plastic. Ducati is an Italian motorcycle manufacturer known for producing high-performance motorcycles, and they use a variety of materials in their construction, including metals like steel and aluminum.
While some components of a Ducati motorcycle may be made from plastic or composite materials, such as fairings or certain body panels, the main structural elements and critical components are typically made from metal. These include the frame, engine, suspension components, and other vital parts.
Ducati motorcycles are renowned for their engineering and craftsmanship, and they are known for their lightweight and agile designs. The use of various materials, including plastic, is often aimed at achieving the desired balance of weight, strength, and aerodynamics to enhance the performance of the bike.