Yamaha Lower Unit Assembly - LZ300 - 6D1-45300-20-8D - See Description for Applicable ModelsYamaha LZ300 Lower Unit Assembly Lower Unit 6D1 45300 20 8D Overview Working on LZ300 setups, you learn quick that the lower unit has to be solid from the start. These motors push hard, and if the gearcase isnt right, youll feel it in the way it shifts and runs. Ive swapped out worn units before, and the difference is immediatequieter, smoother, and more predictable on throttle. This is the kind of part you put in when you want to trust your setup