In a world where every manufacturer abandoned the small displacement four cylinder, Kawasaki built one anyway — and the result is nothing short of extraordinary. The Ninja ZX-25R is the only production 250cc inline-four motorcycle on the market. Four cylinders. 250cc. A redline of 17,000rpm that produces a sound no other quarter litre motorcycle on earth can replicate. Kawasaki's engineers spent years developing an engine that the entire industry had walked away from — downsizing the iconic inline-four configuration to a displacement that makes it accessible, manageable, and utterly addictive in equal measure. 45 horsepower at 15,500rpm sounds modest until you experience what 17,000rpm feels like underneath you. This is not a beginner's motorcycle that happens to have four cylinders. It is a precision instrument built for the pure joy of revving an engine to its absolute limit. Would you take a 250cc inline-four over anything else in the small displacement class? [ Credit: zanuarros...