CG125 motorcycle square head cylinder, cylinder body size, valve hole position and CG125 engine fully match, directly replace the original cylinder, compatible with the piston, cylinder head parts, no need to modify the engine structure; The surface dense heat dissipation bar increases the heat dissipation area, which can quickly export the heat of the combustion chamber, reduce the working temperature of the cylinder block, and reduce the risk of high temperature knock; Built-in valve seat ring and valve catheter, pre-installed and debug before delivery, no need to purchase valve accessories separately, improve overhaul efficiency; The cylinder body adopts high quality aluminum alloy die-casting, high precision of inner wall, with piston ring to ensure the air tightness of combustion chamber, long-term use is not easy to wear; It is the core solution for engine power attenuation and oil burning failure, and is suitable for the deep overhaul scenario of engine cylinder block.