- 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
- 0.480" Spring Lift
Kit Includes:
- 5x CrSi Valve Springs
- 8x Titanium Retainers
- 3x Intake H.T. Steel Basewashers
- 2x Exhaust H.T. Steel Basewashers
NOTE: Compatible with both KPMI seals and the OEM tophat seal.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2002-2004 | Yamaha | Grizzly 660 YFM660F 4x4 | |
| 2005-2006 | Yamaha | Grizzly 660 YFM660FA 4x4 | |
| 2008 | Yamaha | Grizzly 660 YFM660FA 4x4 | |
| 2007 | Yamaha | Grizzly 660 YFM660FG 4x4 | |
| 2001-2005 | Yamaha | Raptor 660R YFM660R | |