Products › 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