This is ready to use. Can ship today. There are some chips and slight bends in some of the cooling fins, One lower cooling fin is broken. There is a small crack in the cam chain tensioner adjuster hole, it will not leak oil. Cylinder has a new bore with a matching OEM + .50 mm Piston kit. Comes with complete top end gasket set. This is in great condition for a daily driver. This will work on: - 2004 to 2013 CRF100 / CRF100F - 2006 NSF100 - 2001 to 2003 XR100 / XR100R An 80$ core charge has been included in price. That core charge will be refunded automatically back onto your original method of payment upon receipt of your core cylinder. Please keep in mind that your core refund can vary depending on the condition of your core cylinders. Broken skirts, cracks into the water jacket, ports, or cylinder wall O-ring groove damage are some of the reasons that you would not receive a full refund. Refunds can be significantly less than the total core refund.