SBT sells the motor on a rebuildable core exchange basis. Visit Program Description for further details.This is a Standard remanufactured SBT 717/720 engine that fits Sea-Doo. It includes the cases, cylinders, trued and welded crankshaft, head, head cover, all new internal parts, a woodruff key and a 1-year no-fault warranty. Installation Gasket Kit required. Please call SBT for shipping rates