Description
- The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves
- Conversion to Black Diamond stainless steel valves offers up to twice the life of the stock titanium valves
- No loss in performance
- Kit includes: piston, rings, clip and pin, Cometic top end gasket kit, Black Diamond engine valves (standard size) and dual spring titanium retainer springs (.395″ lift intake, .0370″ lift exhaust)
- Made in the U.S.A.
- Pistons, rings, valves and pin clips in this kit are designed to work as a system, they are NOT COMPATIBLE with the OEM components and should ONLY be used as a kit.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2007-2009 | Yamaha | WR450F | |
| 2011-2015 | Yamaha | WR450F | |
| 2006-2009 | Yamaha | YZ450F |
