Bore Size STD 74mm Piston Rings Gasket Kit For YS250 YBR250 2007 2009 XT250 XTZ250 1YB 2013-2015 The design focuses on functional and ease of integration into existing engine systems.Installation instructions are included to support straightforward setup.This kit suits riders looking to restore or enhance engine functionality for trail riding, commuting, or general use.The precise fit and optimized engineering aim to contribute to a smoother and more responsive riding experience. Compatibility Clarification: This part is not made by the brand.Mentioned models are for reference only.