Cometic Top End Gasket Kit 89Mm Honda Trx400X / Trx400Ex Sportrax When reassembling your machine after maintenance or a rebuild, trust Cometic's High Performance Top End Gasket Kit. Made from top-quality materials, these kits meet or exceed OEM standards for reliable performance. Features: Raises compression for better low-end power Graphite gaskets feature a steel core, laminated on both sides with flexible graphite Fiber gaskets designed for maximum seal, flexibility and torque retention O-ring gaskets meet or exceed OEM specs