故障29故障现象:一辆本田王款新大洲125骑式摩托车,骑行中出现杂音,故障原因不明。故障诊断与检修:经试车,发现车辆行车颠簸中有来自车辆下后传动部位的金属碰撞杂音,时有时无。似链条敲打金属链盒,又似车辆侧梯、主梯与车辆相关部件碰撞。车辆空挡支起主支撑,转动后轮,检查传动链条是否过长与链盒碰撞,链条 Fault 29 Symptom: A Honda Wangda 125 new riding a motorcycle, riding noise, the cause of the malfunction is unknown. Fault diagnosis and overhaul: The test car, found that vehicle traffic bumps in the transmission part from the vehicle after the metal collision noise, sometimes without. Like a chain knocking metal chain box, like the side of the vehicle ladder, the main ladder and vehicle-related components collision. Vehicles neutral support the main support, rotate the rear wheel, check the transmission chain is too long and chain box collision, the chain