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Athena P400210100067 290cc Big Bore Cylinder Kit (85mm Bore) - Co-Fused Steel Liner Forged Piston Upgrade, Converts 250cc to 289cc, Compatible with Honda CRF250R & CRF250RX 2018-2021

Description

UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 250cc four-stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400210100067), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 290cc (289cc actual) powerhouse. Utilizing an innovative co-fusion production process that integrates a heavy-duty steel sleeve directly into an aluminum outer casting, this unique cylinder maximizes internal bore geometry without requiring structural modifications or machining to your factory crankcase. Lined with a high-durability galvanic nickel-silicon treatment, this setup ensures maximum heat dissipation, reduced mechanical friction, and optimal wear resistance. The complete bolt-on kit comes fully loaded with everything needed for installation—including the advanced hybrid cylinder, a lightweight box-bridged forged piston coated in friction-reducing molybdenum disulfide, a biconical DLC-coated wrist pin, premium rings, wire locks, and a multi-layer high-tightness gasket set—delivering full-bodied torque across all steady states while preserving your bike's agile handling.

Athena P400210100067 290cc Big Bore Cylinder Kit (85mm Bore) - Co-Fused Steel Liner Forged Piston Upgrade, Converts 250cc to 289cc, Compatible with Honda CRF250R & CRF250RX 2018-2021

Product form

SKU: P400210100067

UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from... Read more

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5 in stock 2 - 4 Business Days

$1,079.95

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    • Shipped today? Order within: Jul 06, 2026 14:00:00 -0500
    • Free shipping on all orders. (Shipping only available to lower 48 states)
    • Hassle Free, Returns within 30 days

    Description

    UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 250cc four-stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400210100067), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 290cc (289cc actual) powerhouse. Utilizing an innovative co-fusion production process that integrates a heavy-duty steel sleeve directly into an aluminum outer casting, this unique cylinder maximizes internal bore geometry without requiring structural modifications or machining to your factory crankcase. Lined with a high-durability galvanic nickel-silicon treatment, this setup ensures maximum heat dissipation, reduced mechanical friction, and optimal wear resistance. The complete bolt-on kit comes fully loaded with everything needed for installation—including the advanced hybrid cylinder, a lightweight box-bridged forged piston coated in friction-reducing molybdenum disulfide, a biconical DLC-coated wrist pin, premium rings, wire locks, and a multi-layer high-tightness gasket set—delivering full-bodied torque across all steady states while preserving your bike's agile handling.

    Returns & Delivery

    When will my order be delivered?

    We ship to all lower 48 US states Your order will be packaged and shipped the same day you ordered as long as you order before 2:00 pm CST.
    Delivery takes between 2-4 business days. You will receive an e-mail after ordering with your tracking number so you can track the packages progress to your address.

    Can I return my product?

    Orders can be returned or exchanged within 30 days of receiving the package, provided they are in original resalable condition. If the product has been used or damage, a restocking fee may occur. Please see our Return Policy for further clarification.

    How can I contact you if I have issues or questions?

    You may contact us at sales@massdepot.com Our dedicated customer support will answer your questions or concerns within 24 hours of you reaching out.

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