This motorcycle engine gasket cylinder head set is a replacement part designed to restore the sealing function between the cylinder head and cylinder block.It includes gaskets required for proper assembly and compression integrity in accordance with factory specifications.The set is compatible with RC390 models from 2014 to 2021 and 390 models from 2013 to 2021.Part numbers included: 93730040000, 90230035000, 93830036000, 90230027000.This gasket set replaces the to maintain normal engine and prevent air leakage at the cylinder head interface.