The Honda CBR400 is a Japanese domestic market small-capacity sport motorcycle, part of the CBR series introduced by Honda in 1983. It is the first Honda motorcycle to wear a CBR badge. The CBR400R naked bike was launched in December 1983. The 4-valves per cylinder, air-cooled, four-stroke, DOHC, inline-four engine had a rotational-speed valve stop mechanism "REV" that changed from two valves into four valves at 9,500 rpm. The following two years, it came as semi- and fully faired version as the F3 Endurance. The CBR400R and early CBR400RR models both carry the model numberNC23, which makes up the first part of these bikes' frame numbers. In 1986 the CBR400R was also known as Aero, Jellymould, as it shares its major designfeatures with the rest of the early CBR600F and CBR1000F Hurricane family of motorcycles, which included significantly roundedbody shapes. whereas the later 1988 model was designated CBR400RR and was also known as the Tri-Arm, after its racing inspired braced swingarm. The CBR400RR in 1992 was referred to as the ‘Baby Blade’ replica, then in 1994 it was styled to closely look like the CBR900RR or Fireblademotorcycle. though over the years, in performance and handling it was more closely compared to the CBR600. The CBR400RR preceded the Fireblade by four model years, going through one major rework, CBR400RR-K, CBR400RR-L, CBR400RR-N and CBR400RR-R. The name "Tri-Arm" is shown on the CBR400RR-J's bodywork, along with Hurricane, but the CBR400RR-K dropped the latter designation. livery. The NC23 CBR400RR features a standard extruded beam frame, the rear of the seat unit slopes forwards, and the seat unit subframe is totally separate from the main chassis of the bike. The NC23 & NC29 had several modifications to the frame. The main rails were of a 'cranked' design, the seat support structure had a larger rail that was welded to the frame, the rear of the tail section now had a slight recurve to it, and the swingarm was given a gull-wing shape on one side to give ground clearance for the exhaust link pipe. In 1985, Honda brought a CBR400F to the US for testing, on which Cycle Worldrecorded a time of 13.63 seconds at and a top speed of. In 2013, Honda released the new twin-cylinder CBR400R along with its naked model, the CB400F, and sport adventure model, the CB400X, which is based on the CBR500R, CB500F, and CB500X respectively. These models are sold in Japan & Singapore only.
