High‑output outboard motors use forged outboard motor pistons rather than cast ones. Forging aligns the grain structure of the metal, making the outboard motor piston tougher. These outboard motor pistons withstand higher combustion pressures and RPMs.
Performance outboard motor pistons often have a shorter skirt to reduce friction. The dome shape on some outboard motor pistons increases compression ratio for more power. When upgrading outboard motor pistons, you may need to modify the cylinder head.
Aftermarket outboard motor pistons are available in various compression heights. Balancing outboard motor pistons to within one gram is critical for smooth operation. The ring lands on forged outboard motor pistons are deeper to handle higher loads.
For supercharged outboard motors, special outboard motor pistons with thicker crowns are required. Ceramic coatings on outboard motor pistons reduce heat transfer to the piston body. During assembly, the outboard motor piston must be oriented with the arrow pointing to the exhaust port.
Failing to gap the rings correctly will seize the outboard motor piston in the bore. For tournament fishing boats, reliable outboard motor pistons mean confidence in rough seas.
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