CG125 motorcycle crankshaft assembly, pin diameter of 13MM + shaft diameter parameters and CG125 engine completely match, directly replace the original crankshaft, compatible with the original car connecting rod, gear and other components, without the need to modify the engine structure; Using high quality alloy steel forging + precision machining, high strength, fatigue resistance, can withstand the vibration and impact force of high load engine operation, the service life is consistent with the original factory; After professional dynamic balance debugging before delivery, the vibration during operation is small, which can reduce engine abnormal noise, improve riding comfort, and ensure smooth power transmission; The matching accuracy of journal and gear is strictly in line with the original factory standard. After installation, the meshing with clutch and transmission gear is smooth, without lag and abnormal wear; As the core component of the engine power system, direct assembly can restore the power transmission performance of the crankshaft, suitable for professional engine overhaul.