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Engines and Components› Pistons and Piston Rings

Wiseco

Wiseco 4 Stroke Forged Series Piston Kit, 3.518 IN Bore, 10.5:1 CR

$223.95 $205.78 Save $18.17

SKU: W00C 4778P2

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Description

The Wiseco 4778P2 is a forged piston kit designed for the front cylinder of Harley-Davidson 1340cc Evolution (Evo) Screamin' Eagle applications. This piston features a 3.517-inch bore diameter and is engineered as a direct-fit replacement, requiring no cylinder head modification.

Manufactured from high-strength aluminum alloy, Wiseco forged pistons offer superior durability and thermal management compared to cast alternatives. The included skirt coating reduces friction, minimizes break-in wear, and extends overall piston life under high-stress conditions.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandWiseco
Part NumberW00C 4778P2

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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