Products › ea-Doo 1503 4-Tec Top End Rebuild Kit (.5mm Over) Image 1 of 1 ea-Doo 1503 4-Tec Top End Rebuild Kit (.5mm Over) $745.71 Premium rebuild kit for mid-generation 4-Tec engines requiring minor overbore correction. Add To Cart Added! Premium rebuild kit for mid-generation 4-Tec engines requiring minor overbore correction.