Motorcycle Cylinder Gaskets Full Kit A gasket set designed to enhance sealing between the cylinder head and cylinder block, compensating for relative flatness between these components.It no air leakage occurs after the cylinder head and cylinder block are combined, supporting proper engine.If the cylinder head gasket is damaged, air leakage during engine may result, causing the compression ratio to fall below requirements and leading to engine starting difficulties.Compatibility: Fits YZ250 models from 1999 to 2015.Package Contents: Based on selection.This is a compatible aftermarket component.Brand names are cited solely to show which devices it works with.