901321 K model breather valve, with gear

Restoring a vintage K model requires parts that respect the original engineering. This breather valve with gear is an OEM-style replacement specifically for 1952 to 1955 K and KH models. Proudly made in the USA, it provides the precise timing needed for crankcase pressure management, which is essential for preventing oil leaks and maintaining performance. It is sold individually and replaces OEM numbers 26331-52 and 901321. When you're buttoning up the bottom end of a classic flathead Sportster ancestor, this high-quality component ensures your breather system functions exactly as the factory intended, keeping the crankcase properly scavenged.