Yamaha Lower Unit Assembly - LZ300 - 6D1-45300-30-8D - See Description for Applicable ModelsYamaha LZ300 Lower Unit Assembly Lower Unit 6D1 45300 30 8D Overview On LZ300 setups, the lower unit is doing serious work every time you throttle up. If its not right, youll feel it in the way the boat respondsespecially under load. Ive swapped out worn units that caused noise and rough shifting, and the difference with a solid replacement is night and day. When everything lines up right, you get smooth power delivery and a setup you can trust out on