S&S 3.5 in. bore Cylinder and Piston Conversion Kit for Harley Davidson 1986-20 Increase displacement from 883cc to 1200cc Save time because pistons are already fit to the cylinders-ready to assemble out of the box No machining, re-balancing or cylinder head modifications Includes: S&amp;S 883-1200cc conversion pistons with rings and wrist pins, S&amp;S 3.5 in. bore cylinders, cylinder head, base and exhaust gaskets, assembly lube and instructions Fits 1986-2013 Sportster 883cc