239856 Fits Kb264 and Kb272 Series Pistons for 1200 Evolution Sport

These KB Keith Black Performance piston ring support rings are essential for specific KB pistons where the ring grooves intersect the piston pin hole. While these supports do not perform a sealing function, they are critical for ensuring the piston rings are properly seated and supported during operation. They are typically included with the pistons, but these replacements are perfect if a ring has been lost or damaged during a rebuild. Designed to fit Sportster and XB models, they maintain the integrity of your top end without needing a full piston replacement. Keeping a set of these on the bench is a smart move for any mechanic working on high-performance KB setups.