CBR 600 F2 91-94. The 1991 CBR came in one of two color schemes: Ross White with Fighting Red or Black with Real Blue, Light Blue and Pink. The bike had "60" series radial tires and rated 100 hp (up from 70 hp from 1990). The engine and chassis had a new design, the engine was a 599cc DOHC 16 valve liquid-cooled inline four cylinder linked to a 6-speed transmission. When Honda's 600 debuted in 1987, it was a revelation. Not only was it the quickest and most powerful middleweight ever made, but it also perfectly satisfied the disparate needs of street riders and racers alike, with a finesse no other sportbike had ever achieved before.