CYLINDER FULL KIT 85mm YAMAHA YZ 250F 2024, ATHENA P400485100106 304cc BIG BORE, (Piston included)

Description

Athena big bore cylinder full kit (part reference P400485100106) for Yamaha YZ F 250 applications, increasing displacement via an 85 mm bore to 304 cc. Supplied with high-grade cylinder, forged piston with pin and rings, complete gasket set, and a pre-mapped GET Boost module that installs without ECU or wiring modifications to suit this configuration.

Features

  • Big bore cylinder kit Ø 85 mm, 304 cc to increase performance

  • Cylinder manufactured from high-silicon aluminium alloy with an oversized steel liner

  • Steel liner fused using co-casting process for heat transfer and combustion sealing

  • Forged piston, CNC-machined

  • Molybdenum disulphide piston coating to reduce friction

  • DLC-coated piston pin for hardness and durability

  • Piston rings and pin included

  • Complete gasket set included

  • MLS head gasket, laser-cut stainless steel

  • GET Boost electronic module included, pre-calibrated for this kit

  • GET Boost installs without ECU or wiring modifications

  • Dedicated harness connects to injector and throttle body

  • Pre-mapped to suit the new cylinder configuration

  • Piston included

  • Athena part reference: P400485100106

Specifications

  • Bore diameter: 85.00 mm

  • Displacement: 304.00 cc

Vehicle Fitments

  • YAMAHA YZ F 250 cc (2024 Only)

CYLINDER FULL KIT 85mm YAMAHA YZ 250F 2024, ATHENA P400485100106 304cc BIG BORE, (Piston included)

Product form

Athena big bore cylinder full kit (part reference P400485100106) for Yamaha YZ F 250 applications, increasing displacement via an 85... Read more

1 in stock 1-2 business days

£701.81 Incl. VAT

    • Guaranteed secure & safe checkout.

      shop pay

    SKU: 56-K250.85.KIT3
    Barcode: 0120000080984

    • Free shipping on all orders above £75
    • No hassle returns within 30 days

    Description

    Athena big bore cylinder full kit (part reference P400485100106) for Yamaha YZ F 250 applications, increasing displacement via an 85 mm bore to 304 cc. Supplied with high-grade cylinder, forged piston with pin and rings, complete gasket set, and a pre-mapped GET Boost module that installs without ECU or wiring modifications to suit this configuration.

    Features

    • Big bore cylinder kit Ø 85 mm, 304 cc to increase performance

    • Cylinder manufactured from high-silicon aluminium alloy with an oversized steel liner

    • Steel liner fused using co-casting process for heat transfer and combustion sealing

    • Forged piston, CNC-machined

    • Molybdenum disulphide piston coating to reduce friction

    • DLC-coated piston pin for hardness and durability

    • Piston rings and pin included

    • Complete gasket set included

    • MLS head gasket, laser-cut stainless steel

    • GET Boost electronic module included, pre-calibrated for this kit

    • GET Boost installs without ECU or wiring modifications

    • Dedicated harness connects to injector and throttle body

    • Pre-mapped to suit the new cylinder configuration

    • Piston included

    • Athena part reference: P400485100106

    Specifications

    • Bore diameter: 85.00 mm

    • Displacement: 304.00 cc

    Vehicle Fitments

    • YAMAHA YZ F 250 cc (2024 Only)

    Shipping & Delivery

    How long will my item take to arrive?

    Orders are typically dispatched within 1 working day and are shipped on a 24hour (non-guaranteed) service.

    Where do you ship to?

    We currently only ship orders within the UK.

    How can I track my order?

    Once your order has been dispatched, you will receive a tracking code. Tracking information is emailed to the email address that was provided when placing the order.

    Can I collect my order?

    Unfortunately we do not offer order collections from our fulfilment centre.

    WHY NOT CHECK OUT

    Recently viewed products

      © 2026 Radhouse, Powered by Shopify

        • American Express
        • Apple Pay
        • Diners Club
        • Discover
        • Google Pay
        • Maestro
        • Mastercard
        • PayPal
        • Shop Pay
        • Union Pay
        • Visa