- Replaces the OEM valves and valve springs
- Steel, nitrided valves for increased durability and less wear under extreme conditions
- Stronger valve springs deal with the extra weight of the steel valves
- Springs are made from premium chrome vanadium steel for higher performance and durability at high rpm
- Kit contains a set of steel intake or exhaust valves plus a set of specially designed valve springs; can be installed using the OEM retainers, bases and valve seals
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2003-2009 | Yamaha | WR450F | |
| 2011-2016 | Yamaha | WR450F | |
| 2004-2009 | Yamaha | YFZ450 | |
| 2009-2016 | Yamaha | YFZ450R | |
| 2016 | Yamaha | YFZ450R Special Edition | |
| 2009-2015 | Yamaha | YFZ450RSE Special Edition | |
| 2007 | Yamaha | YFZ450SE Special Edition | |
| 2008 | Yamaha | YFZ450SP Special Edition | |
| 2006-2007 | Yamaha | YFZ450V Bill Balance Edition | |
| 2003-2009 | Yamaha | YZ450F | |