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 direct replacement for specified components.The cylinder features a 95mm bore size tailored to the YZ450F engine design.Constructed from cast iron with a ceramic coating, the cylinder offers enhanced durability.The inner wall incorporates a performance ceramic composite material and a Ni-SiC composite ceramic film, which helps reduce friction and supports efficient combustion.This construction provides improved resistance to wear during.The kit meets ISO9001 external testing certification standards, reflecting adherence to defined quality requirements.It is intended as a functional upgrade for maintaining engine performance.Installation requires no additional components, though instructions are not included.