Cylinder Works Big Bore Cylinder Kit - 4.00mm. Oversize to 91mm. - 31007-1

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders
Three kit options to choose from: Standard Bore, Standard Bore Hi-Compression and Big Bore
Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise
Nickel Silicon Carbide plated for long life
Kits come complete with gaskets, cylinder, piston, rings, pin and clips
Big bore cylinders do not require machine work (unless noted)