Motorcycle Engine Parts Bore 95mm Air Cylinder Block & Piston Rings & Base Gasket Kit Fits For YZ450F 5TA-11311-12-00 This engine parts kit is designed for compatibility with YZ450F models from 2003 to 2005, including part numbers 5TA-11311-12-00, 2S2-11631-20, 5TJ-11631-00, and 2S2-11311-10-00.It includes a cylinder block, piston rings, and base gasket, providing a complete replacement solution for single-cylinder engine setups.The cylinder has a 95mm bore diameter, matching the specifications of the YZ450F engine series.This kit supports direct replacement of components without requiring modifications.It meets ISO9001 external testing certification standards, reflecting consistent manufacturing quality.Designed for use in engines with a displacement of 250ml, it supports in function applications.This replacement is made by an independent supplier.All brand references are used solely to indicate compatibility.