CG125 motorcycle left and right bend box cover, the hole position and cavity of left and right bend box cover and CG125 engine crankshaft, cylinder block, transmission mechanism fully match, suitable for Honda CG125, Pearl River 125 and other top rod locomotive type, directly replace the original box, without modification; Die-cast aluminum alloy integrated molding, high precision cavity, can be stable bearing crankshaft, transmission and other core components, long-term operation is not easy to deformation, leakage; The sealing groove is reserved for the bonding surface of the box body. With sealant/paper pad, it can achieve efficient sealing, avoid oil leakage and ensure the stability of the engine lubrication system. The aluminum alloy material can withstand the high temperature of the engine, and resist the corrosion of oil and gas, and has no rust and aging problems in long-term use.