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Cylinder Works Big Bore Cylinder Kit - 79.00mm - 12001-K01 2007 Yamaha TTR230 2012 Polaris Rush 800 ProCylinder Works Big Bore Cylinder Kit 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 machine work (unless noted) Product Details