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The Yamaha XJ600 is a motorcycle manufactured by Yamaha. It is a relatively light motorcycle with top half fairing and around 72 bhp (54 kW). The XJ600 was built from 1984 until 1991, when it was replaced with the Yamaha Diversion/Seca II. In North America, the bike was sold as the FJ600. The 1984 Yamaha XJ600/FJ600 is notable for being the first Japanese inline-4 with a displacement of 600cc [1]. The XJ was also one of the first bikes inline-4s to use mono-shock rear suspension design.