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Cylinder Works Big Bore Cylinder Kit for 2004-13 Yamaha YFZ450 - 23001-K01 1998 Honda TRX450S 2015 Harley-Davidson Dyna Street BobCylinder Works Big Bore Cylinder Kit Part Number: 23001 K01 Piston Bore: 98. 00mm Ready to install, direct bolt on cylinders require no re plating and look virtually identical to the OEM cylinders Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise Kits come complete with gaskets, cylinder, piston, rings, pin and clips Nickel Silicon Carbide plated for long life Big bore cylinders do not require