Ninja 400 Fork Rebuild – Part 2 of Our Track Bike Conversion

The Metric Maniacs track bike conversion series continues! In part 1 , we began dismantling the front end of a 2018 Kawasaki Ninja 400 by replacing worn stem bearings to improve steering responsiveness. Now in part 2 , we’re rebuilding the front forks with fresh seals to optimize suspension performance.

In this technical DIY video, we fully disassemble the Ninja 400’s front forks, show you step-by-step how to properly replace the fork seals and bushings, then reassemble everything to significantly improve front end handling. Upgrading your suspension is crucial when converting a street bike into a track-ready race machine.

Transforming this lightweight 400cc sportbike into a corner-carving monster takes work - but we show you how to rebuild your forks in a few, simple steps. This suspension upgrade will give you the confidence and feel needed when pushing hard at the track.

Check out the full fork rebuild video now on the Metric Maniacs YouTube channel to see this crucial process from start to finish! And be sure to watch part 1 where we got the front end tear down started.

Let us know in the comments if you have any questions on the Ninja fork rebuild. And stay tuned for more videos chronicling the step-by-step transformation of this Kawasaki into a badass track bike!