517564 Primary case saver

This primary case saver is a simple but highly effective solution for protecting your 1965 to 1984 4-speed Big Twin. Manufactured from durable black nylon, this clamp-on device is designed to safeguard the starter housing area of the inner primary case. On these older machines, the secondary chain can sometimes cause significant damage to the case if it becomes loose or fails; this saver acts as a sacrificial barrier to prevent costly repairs. It is a smart, preventative upgrade that installs easily. This part is a direct replacement for OEM number 517564 and is a great way to add an extra layer of security to your classic drivetrain.