Products › Sea-Doo 1503 / 1630 4-Tec Top End Rebuild Kit (100.96mm) Image 1 of 1 Sea-Doo 1503 / 1630 4-Tec Top End Rebuild Kit (100.96mm) $546.83 Oversize rebuild kit for 4-Tec engines requiring cylinder correction and performance restoration. Add To Cart Added! Oversize rebuild kit for 4-Tec engines requiring cylinder correction and performance restoration.