Motorcycle Accessories Cylinder Gaskets Full Kit For KFX400 KFX 400 2003–2006 The cylinder gasket is a gasket set designed to enhance the sealing between the cylinder head and the cylinder block, compensating for minor irregularities.It ensures that the cylinder head and cylinder block remain sealed to maintain proper engine compression.A damaged cylinder head gasket can lead to air leakage during engine , resulting in reduced compression and difficulty starting the engine.Item Type: Motorcycle Cylinder Gaskets Full Kit Package Includes: Components as selected Fit For: KFX400 2003–2006