Outboard motors operate under very harsh conditions. They are mostly used submerged in seawater, the extremely corrosive salt content. These Yamaha Complete lower units are specifically developed to perform under these conditions. They are strong, durable and can hold on in good form under said contact. The aluminium alloy reduces the weight and proves to be a necessary supplement to our boats. Yamaha Complete lower units are built with side cores making the undercut shape a beautiful advantage.