Summary

  • The Kawasaki Ninja ZX-4RR is a new sportbike that features a powerful 399cc, four-cylinder engine with 76 horsepower, compared to the Ninja 400’s 399cc, twin-cylinder engine with 45 horsepower.
  • The ZX-4RR stands out with its advanced features and electronics, including a 4.3-inch TFT instrument cluster, riding modes, traction control, quickshifter, power modes, and smartphone connectivity, while the Ninja 400 has more basic features.
  • The ZX-4RR has top-shelf underpinnings with adjustable Showa forks, larger disc brakes, and a Showa monoshock, but it is also heavier and larger than the Ninja 400.



Kawasaki has just dropped the bombshell Ninja ZX-4RR for 2023. The sportbike is an ode to four-cylinder, entry-level screamers of yore, and aims to highlight Kawasaki’s modern engineering prowess. However, Team Green already has the Ninja 400 in its portfolio–a global hit, thanks to its peppy performance, likable ergonomics, and affordable price point. So what exactly does the new Ninja do differently? Well, allow us to explain.

Updated September 2023: As new information about the motorcycles and updates comes to light, we will update this article periodically. After all, we want nothing but the best of our audience.

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Kawasaki Ninja ZX-4R vs Ninja 400: Performance


When you look at their names, there’s just a “ZX” to differentiate the two Ninjas. But this moniker is no joke since all “ZX” wearing Ninjas employ four-cylinder engines. The ZX-4R is no exception, debuting an all-new 399cc, four-cylinder mill which screams out 76 horsepower at over 14,000 RPM. On the flip side, the Ninja 400 employs a 399cc, parallel-twin engine to gush out just 45 horsepower – a 31 pony deficit from the ZX. The inline-four mill also benefits from a higher compression ratio (12.3:1 vs 11.5:1) and bigger throttle bodies (34mm vs 32mm), resulting in a manic 16,000 RPM redline, compared to the 400’s 13,000 RPM.

However, the story is a bit different in America. You see, Kawasaki has limited the US-spec ZX-4RR to just ~56 horsepower. The power comes in at 11,500 RPM to keep American noise emissions in check. Still, the figure is considerably more than the 400.


Specification

Kawasaki Ninja ZX-4RR

Kawasaki Ninja 400

Engine

399cc, four-cylinder engine

399cc, twin-cylinder engine

Power

76 horsepower at 14,500 RPM (56 in the U.S.)

45 horsepower at 10,000 RPM

Compression ratio

12.3:1

11.5:1

Transmission

Six-speed

Six-speed

Kawasaki Ninja ZX-4R vs Ninja 400: Features And Electronics


The Ninja 400 has been on sale for nearly five years, yet it has undergone no significant updates. This especially shows in the features department, as it boasts just a digi-analog readout, dual-channel ABS, and slipper clutch. In contrast, the ZX-4R is the newest Ninja in the lineup and has the technology to match. Riding modes, traction control, bi-directional quickshifter, power modes, smartphone connectivity—you name it and the Ninja ZX-4R has it. Plus, all this is accessed by a 4.3-inch TFT instrument cluster, loaded with a dedicated track display mode, just like the Ninja ZX-10R. Not to mention, this makes the ZX-4RR one of the most loaded sub-500cc bikes in America.

Feature

Kawasaki Ninja ZX-4RR

Kawasaki Ninja 400

Instrument cluster

TFT

Semi-digital LCD

Traction control

Yes

No

Quickshifter

Yes

No

All-LED lights

Yes

Yes

Dual-channel ABS

Yes

Optional

Power modes

Yes

No

Smartphone connectivity

Yes

No


Kawasaki Ninja ZX-4R vs Ninja 400: Underpinnings

RELATED: The Manic Kawasaki Ninja ZX-4RR Just Went Faster Than A Yamaha R7!

The same story follows with underpinnings department, too. The Ninja 400 feels quite vanilla, courtesy of its non-adjustable telescopic forks, monoshock, and single disc brakes at both ends. Whereas the ZX-4R is all things top-shelf. You get adjustable Showa SFF-BP forks up top, alongside two 290 mm disc brakes. The rear end comprises a Showa BFRC monoshock, in addition to a single 220 mm disc brake. It’s not all hunky-dory, though, as the ZX-4R weighs 49 pounds more than the Ninja 400. This is backed up by the ZX’ longer length, wider body, and 0.3 gallon bigger fuel tank than the N400. Differences aside, both motorcycles are built around a steel trellis chassis.


Specification

Kawasaki Ninja ZX-4RR

Kawasaki Ninja 400

Frame

Tubular trellis

Tubular trellis

Front suspension

Showa SFF-BP USD forks

Telescopic forks

Rear suspension

Monoshock

Monoshock

Front brake

2x 290 mm disc

310 mm disc

Rear brake

220 mm disc

220 mm disc

Wheelbase

54.3 inches

53.9 inches

Saddle height

31.5 inches

30.9 inches

Tank capacity

4 gallons

3.7 gallons

Kawasaki Ninja ZX-4R vs Ninja 400: Design


Both motorcycles are handsome and fit well in the Ninja family. They have identical ZX-6R-like headlights and a ZX-10R-derived tail section, but the ZX-4R feels fuller and brawnier than the Ninja 400. If you want more colors, though, it’s the Ninja 400 that gives you more variety, while the ZX-4R only comes in Kawasaki’s KRT livery. Design is a subjective affair, so make of that what you will.

Kawasaki Ninja ZX-4RR Colors

Kawasaki Ninja 400 Colors

  • Pearl Blizzard White
  • Metallic Magnetic Dark
  • Metallic Carbon Gray

Kawasaki Ninja ZX-4RR vs Ninja 400: Price

Thanks to the aforementioned bits, it’s quite clear the Ninja ZX-4RR is the more premium, better-equipped motorcycle between the two 400cc Ninjas. And all this comes at a sky-high price of $9,699–$4,400 more than the Ninja 400, and just $1,000 shy of the 2023 Ninja ZX-6R’s MSRP.


Now, we know that’s some serious money for a 400cc motorcycle, but we believe the ZX-4RR packs enough punch to justify it—at least to an extent. Plus, it is targeted toward hardcore motorcycle enthusiasts who want an unmatched riding experience, and not necessarily the “ideal” motorcycle. So tell us, if you had $9,699 to spare, would you pick the RR? Or are you settling for the Ninja 400?

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