Seller notes

New Athena 300cc cylinder big bore kit part number P400485100042 Fits the 2003-2024 YZ250 The picture is directly from Athena, Pictures contents make up this complete kit. Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets.Includes Forged piston, rings, clips and pin.Athena top-end gasket set includes required seals and hardware.Easy-to-follow step-by-step installation instructions.Most are bolt-on; no machining required except where noted.Technical fea...

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