06/16/2026
Evolution of Kawasaki 250cc–400cc Sport Models Part 1 -From Air-Cooled to Liquid-Cooled Engines- From the mid-1970s to the mid-1990s in Japan, passing the riding test to receive an unrestricted motorcycle licence (big bike licence) was very difficult, with a success rate of less than 10%. This led many riders to opt for the sub-400cc motorcycle licence instead because it was easier to obtain, which led to a boom in the 250cc to 400cc motorcycle segment. Following the popularity of Kawasaki two-stroke sportbikes like the KH400, successor to the Mach series, in the 1970s, the Z400FX, launched in 1979 and equipped with an air-cooled, 4- stroke, DOHC In-Line-Four engine, became a huge hit. The smooth ride and invigorating sound made by its four-cylinder engine captured the attention of young riders. In 1982, Kawasaki released the Z400GP, featuring the Uni Trak suspension and more engine power than the Z400FX. It pushed the performance limits of air-cooled sportbikes at the time. In 1985, the GPZ400R debuted as Kawasaki's first 400cc class bike to feature a liquid-cooled engine and full fairing. As the popularity of purely speed-focused supersports soared, the GPZ400R's new liquid-cooled engine, model-specific aluminium frame, and the agile handling concept delivered by its 16-inch front and rear tyres proved popular, making it the best-selling model for two consecutive years.
#カワサ゠#カワサ゠70 周年
