- Compatible with boosted or turbocharged applications
- Designed with increased spring rates and high lift compatibility compared to the stock springs
- CNC-machined titanium or H.T. (Heat Treated) Steel retainers and Cr-Si (Chromium Silicon) alloy dual springs provide valvetrain control at high rpms with high-performance camshaft capability
- Made in the USA
- 0.380" Spring Lift
Kit Includes:
- 3x Intake Titanium Retainers
- 2x Exhaust Titanium Retainers
- 3x Intake CrSi Valve Springs
- 2x Exhaust CrSi Valve Springs
- 3x Intake H.T. Steel Basewashers
- 2x Exhaust H.T. Steel Basewashers
- 3x Intake Rubber Coated Seals
- 2x Exhaust Rubber Coated Seals
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2007-2008 | Yamaha | Grizzly 450 YFM450FG 4x4 | |
| 2009 | Yamaha | Grizzly 450 YFM450FGI 4x4 IRS | |
| 2003-2009 | Yamaha | WR450F | |
| 2011-2015 | Yamaha | WR450F | |
| 2004-2009 | Yamaha | YFZ450 | |
| 2012-2013 | Yamaha | YFZ450 | |
| 2009-2023 | Yamaha | YFZ450R | |
| 2016 | Yamaha | YFZ450R Special Edition | |
| 2017-2023 | Yamaha | YFZ450RSE | |
| 2009-2015 | Yamaha | YFZ450RSE Special Edition | |
| 2007 | Yamaha | YFZ450SE Special Edition | |
| 2008 | Yamaha | YFZ450SP Special Edition | |
| 2006-2007 | Yamaha | YFZ450V Bill Balance Edition | |
| 2010-2011 | Yamaha | YFZ450X | |
| 2010 | Yamaha | YFZ450X Bill Balance Edition | |
| 2011 | Yamaha | YFZ450XSE Special Edition | |
| 2003-2009 | Yamaha | YZ450F | |