Products › Sea-Doo 1503 / 1630 4-Tec Top End Rebuild Kit (99.96mm Standard) Image 1 of 1 Sea-Doo 1503 / 1630 4-Tec Top End Rebuild Kit (99.96mm Standard) $546.83 Standard bore rebuild kit designed to bring engines back to factory spec performance. Add To Cart Added! Standard bore rebuild kit designed to bring engines back to factory spec performance.