504375 Replacement XL1000 cast piston. +.030"

This +0.030-inch oversize replacement cast piston fits 1972-1985 XL1000 Sportster engines that have been bored to address moderate cylinder wear. With the standard 9:1 compression ratio, it maintains factory-correct performance for a reliable stock rebuild. Each piston comes with wristpin and wristpin clips included, while piston rings are sold separately. The cast construction provides a low thermal expansion rate and comes at a significantly lower cost than forged OEM replacements. A qualified technician should verify component suitability before installation. Following standard break-in and riding procedures is essential for proper ring seating and long-term engine reliability on your rebuilt Ironhead Sportster.