901322 K model/Sportster breather valve, with gear

This USA-made breather valve and gear assembly is designed for the transition years of the Sportster lineage. It fits 1956 to 1959 KH models and XL Sportsters, providing a reliable OEM-style replacement for the original breather timing gear. Proper crankcase breathing is often overlooked, but it's the key to keeping gaskets from blowing out under pressure and ensuring efficient oil return. Sold individually, this unit matches OEM 26331-56 and 901322. It’s a high-quality component that offers the durability and fitment required for a professional-grade engine rebuild on these classic 1950s machines, helping to maintain internal pressure balance.