CG125 motorcycle engine positioning pin, the diameter and length of positioning pin and CG125 engine cylinder block, cylinder head installation positioning hole completely match, directly replace the original pin without modifying the installation structure; High quality stainless steel processing, high strength, not easy to deformation, can withstand the cylinder block/cylinder head assembly positioning force, long-term use without slack; Precise dimensional tolerance ensures accurate assembly position of cylinder block and cylinder head, avoiding problems such as seal failure and component interference caused by misalignment; Stainless steel is resistant to sunlight and oil corrosion, suitable for long-term high temperature and high humidity working environment of the engine.