The KTM RC390's engine is a product of the collaboration between KTM and Bajaj Auto. KTM, an Austrian motorcycle manufacturer, and Bajaj Auto, an Indian motorcycle manufacturer, have had a long-standing partnership. The two companies joined forces to develop and manufacture motorcycles under the brand name KTM in India.
The engine used in the KTM RC390 is a single-cylinder, liquid-cooled unit with a displacement of 373.2cc. It is part of the Duke/RC series of motorcycles developed jointly by KTM and Bajaj. While KTM provides the design and engineering expertise, Bajaj Auto handles the manufacturing and production of these motorcycles, including the engines.
Therefore, the engine in the KTM RC390 is a result of the collaboration between KTM and Bajaj, with KTM contributing the technical know-how and Bajaj responsible for the manufacturing processes.