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  • 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.
  • NOTE: 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.

 
This item fits the following models:
 
Yamaha YZ250F 2014 - 2016
Yamaha YZ250FX 2015 - 2017