18631-52 Gaskets, O-rings & Seals for K, KH, XR & Ironhead Sportster 1952-1971

This Athena gasket is designed for the unique requirements of the K and KH models from 1952 to 1956, as well as XR and Ironhead Sportster models from 1957 to 1971. It is a direct replacement for OEM 18631-52 and is specifically suited for KH and KR models. Maintaining these early Sportster-family engines requires parts that can handle the high-vibration and high-heat environment of a performance-oriented V-twin. Athena’s gaskets are built to meet these challenges, offering a precise fit and a dependable seal. Whether you are restoring a classic racer or keeping a vintage street bike in top shape, this individual gasket provides the professional quality needed to ensure your engine stays oil-tight and reliable.