Products › Sea-Doo 900 Top End Rebuild Kit (1mm Over, 75mm) Image 1 of 1 Sea-Doo 900 Top End Rebuild Kit (1mm Over, 75mm) $565.43 Full rebuild solution for heavily worn cylinders requiring 1mm overbore. Built for durability and performance. Add To Cart Added! Full rebuild solution for heavily worn cylinders requiring 1mm overbore. Built for durability and performance.