Niche Industries 2455 is a new Cylinder Kit and has everything you need to rebuild your Top End including: Cylinder, Cylinder Head, Wiseco Piston Kit, Head and Base Gaskets, Needle Bearing, Cylinder Studs, Stud Nuts and an NGK Spark Plug. The Cylinder is solid cast iron and has been treated with a black powder coat, and has been factory-honed and deburred. The Cylinder does not include a vacuum port. The Cylinder Head is cast aluminum, and the Performance Piston and Piston Rings are forged and manufactured by Wiseco. All Kit components are manufactured to the same size and standards as your originals and are engineered to exceed stock standard performance. When your Top End rebuild Kit arrives, your parts are ready to install. Complete Standard Sized Cylinder and Wiseco Performance Piston Kit With Gaskets. Includes OE Type Head, Wiseco Piston Kit, Gasket Kit and More! Cylinder Does Not Include Vacuum Port. High-Quality Wiseco Forged Aluminum Piston for Superior Strength to Weight Ratio. Cylinder Bore Size 41mm and a 37.80 mm Stroke. The Cylinder Displacement is 49cc and has a 5.6:1 Compression Ratio; Cylinder Material: Steel; Cylinder Sleeve Coating: None. Quality and Performance guaranteed! Cylinder Cylinder Head Piston Piston Rings Wristpin Circlips (2) Head Gasket Base Gasket Cylinder Studs (4) Cylinder Stud Nuts (4) Spark Plug.