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Engines and Components Pistons and Piston Rings

Athena

Athena 10-18 Yamaha YFZ 450 Bill Balance Edition 97.94mm Big Bore Cyl 4T Forged Racing Piston

$344.95 $264.14 Save $80.81

SKU: A0EF S4F09800004A

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In Stock
Ships by Jun 20
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The ATHENA S4F09800004A Big Bore Cylinder and Forged Piston Kit is an upgrade for Yamaha YFZ 450 models, designed to increase power, torque, and engine displacement. This kit includes a high-grade aluminum alloy cylinder with a nickel-carbide coating and a high-performance forged race piston for durability and thermal stability.

Fitment

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Specifications

BrandAthena
Part NumberA0EF S4F09800004A

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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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