Kawasaki is hardly new to the lightweight sportbike market. The Ninja 250R debuted Stateside for 1986 and, after several generations, was finally replaced by the Ninja 300 in 2013. The Ninja 400 then supplanted the Ninja 300 for 2018. Cheaper to buy, finance, insure, and handle than larger sportbikes, the Ninja 400 features a 399cc DOHC parallel twin integrating fuel injection, liquid-cooling, and a six-speed transmission. The extra 35-percent displacement over the Ninja 300 goes a long way toward making a sportbike that can easily match fast-moving traffic, instead of struggling.