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Complete standard bore kits Complete standard bore high compression kits Complete Big Bore Kits Includes cylinder, piston kit and gaskets Matched with vertex pistons to ensure longevity, performance and reduce engine noise Replacement piston, gaskets, and ring sets available Cylinder looks just like stock Nickel silicon carbide plated for longer life No machine work needed * Replacement cylinder' standard bore only *Honda CRF250R and CRF250X require slight case modification. Kit comes with instructions. +Yamaha YZ85 cylinder head modification required. # Yamaha YZ85 cylinder head modification required, AND +2mm strocker crank required.