APE is a leading manufacturer of racing valve springs for the powersports industry.  APE springs are world renowned in drag racing, road racing and endurance racing.  This same expertise is used in the design and manufacturing of these new CRF springs.  Manufactured from the finest super clean, chrome silicone valve spring wire, for reliable, long life service.  Exclusive titanium valve spring retainers are manufactured in APE's state of the art CNC facility, from premium aircraft grade Titanium.  APE is the only company that manufactures titanium retainers and builds cylinder heads.  Made in the USA.


APE high performance valve springs have two springs per valve to satisfy even the most demanding cam profile.  Able to withstand high lift at high RPM's the inner spring and outer spring work together to deliver unequaled performance and reliability.  These APE valve springs will fit all Suzuki DRZ400 and LTZ400's, Arctic Cat DVX400's, and Kawasaki KLX400 and KFX400's.  Sold as kit of four with with inner and outer springs and titanium retainers.  Will work with any manufacturer's valves.

These APE valve spring kits will fit ALL of the following models:

• Arctic Cat DVX400 ATV, 2004-2008
• Kawasaki KLX 400, 2001-2008
• Kawasaki KFX400 ATV, 2001-2008
• Suzuki DRZ400, 2000-2012
• Suzuki LTZ400 ATV, 2000-2010