This model code identifies the 2001 introduction of Kawasaki’s ZRX1200S, the half-faired sport-touring member of the ZRX1200 family. Kawasaki launched the ZRX1200 line in 2001 as the successor to the ZRX1100, extending the brand’s retro-muscle roadster formula into a larger-displacement era while keeping the classic upright styling that echoed earlier Kawasaki performance bikes. Within that new family, the S variant was the more wind-protected, touring-oriented version, positioned alongside the naked and lower-faired siblings rather than as a separate long-running nameplate of its own.
The B1 designation is the first-year code for this version, and it appears in Kawasaki’s 2001 model-recognition documentation as a 2001-market motorcycle. In enthusiast terms, it belongs to the early ZRX1200 generation that helped reestablish Kawasaki in the large-displacement standard class at the start of the 2000s. The model is remembered for combining the ZRX retro look with practical fairing coverage, making it one of the more distinctive members of the ZRX lineup.