504370 Replacement XL1000 cast piston. +.010"

This +0.010-inch oversize replacement cast piston is designed for 1972-1985 XL1000 Sportster engines with minimal cylinder wear requiring a light hone and slight overbore. Retaining the standard 9:1 compression ratio, it supports a factory-specification stock rebuild. The piston comes complete with wristpin and wristpin clips, while piston rings must be purchased separately. Cast type construction offers a low expansion rate and is significantly more affordable than OEM forged alternatives. Professional assessment of component compatibility is essential before installation, and adherence to standard break-in procedures ensures proper ring seating. An economical choice for rebuilding your XL1000 Ironhead to reliable running condition.