TM-P40-103 Sea-Doo 657 Premium Engine This is a Premium remanufactured Sea-Doo 657 engine. It includes the cases, cylinders, trued and welded Crankshaft, head, head cover, all new internal parts & a woodruff key. 2-year no-fault warranty. See below for all associated parts. Installation Gasket Kit required. Applications: 1993-1994 XP 1994-1995 GTX 1994-1995 SPX SHIPPING price includes: old core exchange and return shipping of the NEW CORE.