Yamaha Lower Unit Assembly - 689-45300-07-4DYamaha Lower Unit Assembly Gearcase Component 689 45300 07 4D Overview The lower unit assembly is a critical component of your Yamaha outboard, responsible for transferring engine power to the propeller for efficient propulsion. Built with Yamahas precision engineering, this gearcase assembly ensures smooth shifting, consistent performance, and dependable operation on the water. Its durable construction is designed to withstand harsh marine
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