504385 Replacement XL1000 cast piston. +.050"

This +0.050-inch oversize replacement cast piston accommodates more significant cylinder wear on 1972-1985 XL1000 Sportster engines. With the standard 9:1 compression ratio, it supports a stock rebuild that restores factory performance. Each piston includes wristpin and wristpin clips, with rings purchased separately. The cast design provides stable thermal expansion and an economical alternative to OEM forged units, making it well suited for reliable everyday use. A knowledgeable mechanic must assess component compatibility prior to installation, and standard break-in procedures are essential for proper ring seating. An ideal choice for bringing a high-mileage Ironhead Sportster back to dependable running condition.