Products › Sea-Doo 1503 4-Tec Top End Rebuild Kit (Standard) Image 1 of 1 Sea-Doo 1503 4-Tec Top End Rebuild Kit (Standard) $546.83 Standard bore rebuild kit for 1503 engines. Restores efficiency and reliability. Add To Cart Added! Standard bore rebuild kit for 1503 engines. Restores efficiency and reliability.