C9530 O-ring mainshaft needle bearing

This Cometic O-ring is designed for the mainshaft needle bearing on classic Harley-Davidson gearboxes. It serves as a direct replacement for OEM 11166 and is essential for maintaining proper lubrication and preventing leaks within the transmission assembly. This specific seal fits late 1984 to 1986 4-speed Big Twin models. When you have the transmission apart for a rebuild or bearing replacement, using a fresh Cometic O-ring ensures a reliable seal that stands up to the rigors of the road. These are sold in a pack of 25, making them an essential stock item for any mechanic specializing in vintage Big Twin transmission work.