CG125 motorcycle five-speed main and secondary shaft assembly 147mm 5-gear transmission shaft

CG125 motorcycle five-speed main and countershaft assembly, moulded 1:1 according to the CG125 original 5-speed gearbox, countershaft length 147mm, standard layout for 5 gears, spline pitch and shaft diameter perfectly match the original gearbox casing and gear set, can directly replace old parts without modification or adjustment; made of 40Cr alloy steel forging, gear teeth subjected to high-frequency quenching treatment, hardness HRC50-55, wear-resistant and impact-resistant, can withstand long-term meshing friction inside the gearbox, preventing issues such as tooth breakage and wear deformation; gear tooth profile precision machined by CNC, tooth clearance controlled within 0.01mm, smooth meshing transmission with no jerking, noise reduced by 30%, enhancing riding comfort; the overall assembly undergoes high-temperature tempering and low-temperature ageing treatment, heat dissipation efficiency increased by 25%, capable of handling long rides and high-load conditions such as uphill climbing, preventing shaft deformation from high temperature affecting transmission performance; includes main shaft, countershaft, and matching 5-speed gear set, no need to purchase additional individual parts, ready for direct assembly, significantly reducing repair and replacement time