The Traxxion Dynamics Fork Spring Kit includes two new Omni springs that are shorter and lighter weight than the OEM springs, and two new aluminum spacers cut to the proper length to replace the heavy steel OEM spacers. This kit is a directly replacement for the OEM springs and spacers, no modification is necessary.
The Traxxion Dynamics Fork Spring Kit is an absolute necessity for anyone who intends to ride their Ninja 400 at a spirited pace and doesn’t want to invest in a full fork cartridge or damper rod kit. Using proper springs for your weight and balancing the bike will completely change it’s handling and make the bike safer and more enjoyable to ride. Fork springs are easy to install and inexpensive and make a world of difference in how the bike feels.
The OEM front fork springs in the Ninja 400 are progressive and can work okay for lighter weight riders. For better handling and more consistent performance, use the spring rate chart here as a guide for our recommendations for the Kawasaki Ninja 400.