240-GSKTM80593
Swapping out a piston kit?, don't forget the gaskets. Some will tell you not to worry about them they can be reused, this is sometimes the case but it is always better to replace the gaskets and at this price why not. These high quality kits contain all the gaskets and o-ring need to complete a top end job. For 2007 SX 250 copy and paste this into the red search box - Top Gasket Kit KTM 250/300 2008->2016 Cometic.
Image is generic, actual will differ.
