实例一 故障现象:一辆西湖XH90型踏板车,最近一段时间连续拉缸,车主认为零件质量不好,从原厂邮购了汽缸、活塞、活塞环,但用了不到半个月,再次拉缸。 故障分析与排除:拆下火花塞观察,电极呈棕红色,这说明此车燃烧正常,电路、油路应无问题。检查机油壶机油清澈、粘性很好。更换汽缸、活塞、活塞环后,启动发动机,从化油器上拔下机油管观察,机油泵泵油充足。路试车辆,该车提速顺畅,没有明显的异常现象。询问车主每次换缸后是否进行磨合,是否常用此车跑长途,车主表示从不开快车,也就每天上下班骑 Case a failure phenomenon: a West Lake XH90-type scooters, the recent period of continuous pull cylinder, the owner that the poor quality of parts, mail order from the original cylinder, piston, piston ring, but in less than two weeks, pull again Cylinder. Failure Analysis and Troubleshooting: Remove the spark plug observed, the electrode was brown red, indicating that the car is burning properly, the circuit, the oil should be no problem. Check the oil machine oil is clear, very good viscosity. Replace the cylinder, piston, piston ring, start the engine, unplug the oil pipe from the carburetor observation, enough oil pump oil. Road test vehicles, the car speed and smooth, there is no obvious anomalies. Ask the owner whether to run after each change for the cylinder, whether it is commonly used for long-distance car run, the owner said never drive fast, also on a daily commute