They are also one of the first inline-4 motorcycles to use mono-shock rear suspension. Yamaha motorcycles are now renowned for their motocross bikes. The first of these was produced in 1975. In 1977, Yamaha Corporation, U.S.A. was founded exclusively for the sale of Yamaha motorized products and to meet the needs of an American market. The XJ600 was built from 1984 until 1991, when it was replaced with the Yamaha Diversion/Seca II. The Yamaha XJ600 is a motorcycle manufactured by Yamaha. Yamaha XJ6 review (2009-on) Yamaha XJ6 Diversion review (2009-on) Yamaha XJ6 Diversion F review (2010-on) ... 3 out of 5 xj 600n. The 1984 Yamaha XJ600 and FJ600 were notable for being the first Japanese inline-4 motorcycles with a displacement of 600cc. Make Model: Yamaha XJ 600N: Year: 1995 - 97: Engine: Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder : Capacity: 599 cc / 36.5 cu-in These first Yamaha brand cycles sold in America were the YD1 and the MF-1. It is a relatively light motorcycle with top half fairing and around 72 bhp (54 kW). 30 September 2011 by gstring75. In North America, the bike was sold as the FJ600. More Yamaha XJ family motorbikes.