Kawasaki Ninja Zx-4r

"The best small-bore inline-four you can buy right now."

The ZX-4R is genuinely one of the most exciting small-displacement bikes Kawasaki has built in years, and the used market is starting to make sense financially. That inline-four screamer revving to 17,000rpm delivers a hit that'll embarrass plenty of middleweight twins when you're in the upper half of the rev range. First-year examples (2023) occasionally show up with throttle-by-wire glitches and some owners reported rough idle behavior cold — worth checking on any used example you inspect. Practically speaking, these things have been thrashed. Most ZX-4R owners bought them specifically to push limits, so inspect brake pads, chain wear, and look underneath for fairing rash religiously. The quickshifter on base models is an optional extra, so confirm what spec you're actually buying. Service intervals are tighter than a 600, and valve clearance checks aren't cheap. That said, if the mechanicals are solid, you're getting a chassis that genuinely communicates, suspension that's adjustable and capable, and a soundtrack that makes riding genuinely addictive again. Worth every cent of a clean example.