Cylinder Works 10001-K02 08-09 Honda CRF 250 R 250cc Standard Bore Cylinder KitCylinder Works 10001 K02 08 09 Honda CRF 250 R 250cc Standard Bore Cylinder Kit Description Cylinder Works Standard Bore Cylinder Kit Fits Models CRF 250 R (08 09) Specs Uses Vertex #23443 Compression Ratio12. 9: 1 Cylinder Diameter78 mm Cylinder Kit Type: Standard Bore Displacement: 250 cc Engine Type: 4 Cycle Includes: Cylinder, Piston Kit Top End Gasket Kit