Yamaha Lower Unit Assembly - 689-45300-17-4DThis product has been superseded by: 689 45300 18 8D Yamaha Lower Unit Assembly Gearcase Component 689 45300 17 4D Overview The lower unit assembly is a critical component of your Yamaha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. Engineered with precision, this assembly ensures smooth gear engagement and consistent performance across a wide range of marine conditions. Its durable construction is
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