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    Cylinder Works

    Cylinder Works 21-22 Gas-Gas EX 250 F 250cc +3mm Big Bore Cylinder Kit 270cc

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    OEM in apperance, yet performance driven in design. The Cylinder Works Big Bore Cylinder Kits contain a hand matched big bore Vertex piston and top end gasket kit wtih o-rings in an all-in-one kit, providing cost savings over purchasing OEM components separately.