The Modenas KR3 (later known as the Proton KR3) was a racing motorcycle made by the Malaysian motorcycle company Modenas. The bike was used in the 500cc class of grand Prix motorcycle racing from 1997 until 2001, when the company got taken over by the Malaysian automobile company Proton. Proton renamed the bike, calling it the Proton KR3 and using it for three more seasons - from 2002 to 2004 - before replacing it with the newer machine.