***Compatible with GAS GAS models below: -2010 EC250F -2011 EC250F -2012 EC250F -2013 EC250F -2014 EC250F -2015 EC250F ***Compatible with Kawasaki models below: -2004 KX250F -2005 KX250F -2006 KX250F -2007 KX250F -2008 KX250F -2009 KX250F ***Compatible with Suzuki models below: -2004 RM-Z250 -2005 RM-Z250 -2006 RM-Z250 ***Compatible with Yamaha models below: -2005 WR250F (Will only work with Namura piston) -2005 YZ250F (Will only work with Namura piston) -2006 WR250F (Will only work with Namura piston) -2006 YZ250F (Will only work with Namura piston) -2007 WR250F (Will only work with Namura piston) -2007 YZ250F (Will only work with Namura piston) -2008 WR250F (Will only work with Namura piston) -2008 YZ250F (Will only work with Namura piston) -2009 WR250F (Will only work with Namura piston) -2009 YZ250F (Will only work with Namura piston) -2010 YZ250F (Will only work with Namura piston) -2011 WR250F (Will only work with Namura piston) -2011 YZ250F (Will only work with Namura piston) -2012 WR250F (Will only work with Namura piston) -2012 YZ250F (Will only work with Namura piston) -2013 WR250F (Will only work with Namura piston) -2013 YZ250F (Will only work with Namura piston)