The Ninja 400 / Z400 have decent enough brakes for street use, with their 310mm floating front disc.  It’s larger in diameter than similar bikes like the Yamaha R3 (298mm).  The OEM pads have what seems to be the standard “OEM feel” for budget oriented bike, very wooden, lacking any substantial bite, and requiring a

The Kawasaki Ninja 400 and Z400 are awesome little bikes!  Kawasaki made some advancements to the little bike scene offering a 400cc package that was just as lightweight (or lighter) and nimble as other 250cc and 300cc bikes.  But like with anything that’s a brand new design, there are a few quirks that should be

*Keep in mind, these are only general recommendations for spring rates to get you close for your weight. Optimum spring rate is affected by countless variables including riding style, preference, pace, track layout and surface finish, and bike geometry and suspension setup.  Generally faster racers will prefer springs at the stiffer end of their range.

*Keep in mind, these are only general recommendations for spring rates to get you close for your weight. Optimum spring rate is affected by countless variables including riding style, preference, pace, track layout and surface finish, and bike geometry and suspension setup.  Generally faster racers will prefer springs at the stiffer end of their range.

coming soon, address these things first!

coming soon!

coming soon.

Moto Journalist Nic De Sena did a test ride with us comparing a stock Kawasaki Ninja 400 to our Ninja400R superbike at a trackday at Chuckwalla Raceway. Pretty cool article, thanks Nic!

***Update 2024*** The Ninja 500 / Z500 is showing the same issues, as it’s the same components for the most part between the Ninja 400 and 500. Items that are different: clutch pull rod and bearing (updated in 2020 on the Ninja 400), and clutch springs. Our Ninja 500 Race Spec Clutch Kit has been