Motorcycle Engine Parts Bore 95mm Air Cylinder Block & Piston Rings & Base Gasket Kit Fits For YZ450F WR450F 2S2-11631-20 Material Type: Cast iron / ceramic Displacement: 250cc Model Name: YZ 450 F WR 450 F 2S2-11631-20 Number of Cylinders: 1 Cylinder External Testing Certification: ISO9001 Special Features: Direct replacement for parts 2S2-11631-10 and 2S2-11311-10-00 This bore 95mm air cylinder block kit is designed for use with YZ450F and WR450F motorcycles.Constructed with a cast iron core and ceramic coating on the cylinder walls, it provides increased wear resistance and reduced friction, contributing to improved engine efficiency and performance.The material composition supports stable under temperatures and offers resistance to corrosion, suitable for various riding environments.The kit includes the cylinder, piston rings, and base gasket, providing all necessary components for installation.It serves as a direct fit for YZ450F models from 2006 to 2009 and WR450F models from 2007 to 2011, replacing part numbers 2S2-11631-10 and 2S2-11311-10-00.Designed for straightforward integration into existing engine assemblies, it supports engine rebuilds or performance.This is a replacement part from a third party.All brand/model references serve only to show intended compatibility.