Activity at the entry level of the sportbike class was evident at Kawasaki, which showed its ‘08 Ninja 250R, a thorough makeover of a longtime favorite. The revamped model, which sells for $3,499, has racier-looking bodywork and an updated two-cylinder engine. Kawasaki has also overhauled the Ninja ZX-10R with a new ram-air intake system and improved brakes.