OEM Yamaha Outboard Crankshaft Balancer. Fits many 3.1L & 3.3L powerheads for many years including carbureted, HPDI & OX66 models. I’ve included the part number so please do your research. Part #61A-11586-00-00 supersedes to 61A-11586-01-00. We found a near perfect nut with grease seal to send with balancer. Guaranteed to function correctly.