Sea-Doo › Sea-Doo 1503 4-Tec Top End Rebuild Kit (.5mm Over) Image 1 of 1 Sea-Doo 1503 4-Tec Top End Rebuild Kit (.5mm Over) $546.83 Precision rebuild kit for early 4-Tec engines with .5mm oversize piston Add To Cart Added! Precision rebuild kit for early 4-Tec engines with .5mm oversize piston You Might Also Like Sea-Doo 580 Top End Rebuild Kit (Standard 76mm) $238.56 Sea-Doo 900 Top End Rebuild Kit (.25mm Over, 74.25mm) $565.43 Sea-Doo 1503 4-Tec Top End Rebuild Kit (Standard) $745.71 Sea-Doo 580 Top End Rebuild Kit (1mm Over, 77mm) $238.56 Sea-Doo 1503/1630 4-Tec Top End Rebuild Kit (99.96mm Standard) $546.83