504365 Replacement XL1000 cast piston. +.020"

This +0.020-inch oversize replacement cast piston suits 1972-1985 XL1000 Sportster engines requiring a light overbore to correct cylinder wear. Maintaining the standard 9:1 compression ratio, it is well suited for stock rebuilds that demand factory-correct performance. Each piston includes the wristpin and wristpin clips, with piston rings sold separately. Cast construction provides a low thermal expansion rate for consistent piston-to-wall clearance throughout operating temperature ranges. A qualified mechanic must assess compatibility with other engine components before installation. Following standard break-in and riding procedures ensures proper ring seating and maximises the service life of your rebuilt Ironhead engine.