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Yamaha Motor Revs Your Heart

OEM Casting and Forging

Lower Unit

Our corrosion-resistant aluminum alloy gives the lower unit the durability and reliability needed in an outboard.

Lower Unit

Lower Unit

The lower unit makes up the bottom-most part of an outboard motor, meaning this part spends most of its time submerged in highly corrosive saltwater environments. The lower unit is cast with an aluminum alloy (YDC30, Al–Si series) specifically developed to improve corrosion resistance, and it also has the strength and rigidity to withstand impacts with things like driftwood. The use of a side core makes its undercut shape possible.

Product category Outboard Motors
Casting method High-pressure die-casting
Material Aluminum alloy (ADC3)
Used for Lower unit
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