This is the easiest way to convert your 04-UP Sportster 883 to a 1200. These big bore kits contain everything you need to convert your stock bike, with no head work necessary. Each kit contains 2 pre-fit cylinders with Wiseco 9.5:1 compression pistons and matching piston rings. This kit fits 2004-UP Harley-Davidson Sportsters and features black cast finished cylinders. Note: Gaskets are not included.