CYLINDER WORKS STANDARD BARRELS, BIG BORE KITS, GASKETS & RING SETS FOR 4 STROKE OFF ROAD MOTORCYCLESCylinder Works has produced a line of four stroke big bore kits. These are sold complete with gaskets, cylinder, and a piston kit. Cylinder Works big bore cylinder barrels look virtually identical to the OEM and are Nickel Silicon Carbide plated for long life and are super convenient - just purchase and install, no machining required*.*Honda CRF250R and CRF250X models require slight case modification.Cylinder Works has also produced a range of standard cylinder barrels. Currently cylinder bores require re-plating after the cylinder becomes worn or damaged. The process of plating can be an inconvenience due to down time' for this process to be completed. Cylinder Works eliminates these hassles by providing a ready-to-install cylinder barrel. Cylinder Works standard cylinder barrels look virtually identical to the OEM and are Nickel Silicon Carbide plated for long life and honed to exact size for easy piston installation.The Cylinder Works range also includes Pistons, Ring Sets and Gasketsfor the Big Bore Kits Fits: Honda CRF250R 2004 2008 CRF250X 2004-2007 2009-2017