Where Sound Meets Soul: KAWASAKI ZX-4RR Custom

Webike's Opinion

Here is a "KAWASAKI ZX-4RR" custom by Webike community user "Cha-jijii3". It is the 2025 model. Its 399cm³ inline four-cylinder engine delivers class-leading performance, all packed into a chassis as compact as a typical 250cc-class model. The owner recommends it even for beginner riders, praising its lightweight feel and easy handling.

What the owner loves most about this bike is the engine sound and exhaust note. "It just feels so good," he says. While the stock exhaust was already satisfying, he opted to install a TRICK STAR IKAZUCHI titanium silencer. Its uniquely engineered interior, transitioning from a circular to a hexagonal shape like a finely crafted musical instrument, produces a high-pitched tone that rises with engine RPM.

The handlebars are fitted with the highly rated DAYTONA Multi-bar Holder, known for its excellent usability. Mounted on it is the Kaedear Devil Horn smartphone holder, which allows for quick one-handed attachment and removal. For winter rides, the owner has also equipped the bike with SP Takegawa Heated Grips, which he says are outstanding. Power is supplied via the USB outlet of the Kaedear Devil Horn, and installation is as simple as wrapping the heated sheets around the grips—no hassle involved. “I remove it in early spring, so something simple like this is perfect. And as for warmth, it's incredibly effective. No surprise, given it's a 12V system,” the owner says, impressed by its practicality.

The stock resin rear fender, which didn't quite suit the bike’s agile styling, has been replaced with a fender eliminator kit from DAYTONA. “This setup actually blends more naturally with the body,” notes the owner. The stock lime-colored SHOWA BFRC Lite rear suspension performs exceptionally well—it tracks the road so smoothly after hitting a bump that “you start to wonder if the tire is made of slime,” the owner jokes. Fine-tuning the front forks is next on the list, and it seems the day this ZX-4RR becomes truly unbeatable isn't far off.

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