Yamaha XJ900 Diversion (1994-2004) The Yamaha XJ900 is a motorcycle manufactured by Yamaha from 1983. It was a development of the original Yamaha XJ model, the XJ 650, which was the foundation for the entire XJ series. In its original incarnation, the XJ900 had an air-cooled, double overhead camshaft, 853 cc (52.1 cu in) 4-stroke, 4-cylinder, 8-valve ...