MTC先生:您好!我有一辆嘉陵JH70型摩托车,新车买来不到一年,就出现如下故障:(1)前照灯灯炮变黑(能使用),更换多次都是如此。(2)车子在平直的道路上跑不到最高速,一般只有60公里每小时左右。(3)油门加到一定位置就出现发动机断火的现象,过了这一位置便恢复正常。在检修过程中,更换了火花塞、点火线圈、电子点火器、硅整流器,清洗了化油器和空气滤清器,清理了燃 Mr. MTC: Hello! I have a Jialing JH70 motorcycle, the new car bought less than a year, there are the following failures: (1) headlamp bulbs black (can be used), the replacement is so. (2) The car can not run at the highest speed on a straight road, usually only about 60 kilometers an hour. (3) the throttle added to a certain position on the phenomenon of the engine off the fire, after this position will return to normal. In the repair process, the replacement of the spark plug, ignition coil, electronic ignition, silicon rectifier, cleaning carburetor and air cleaner, clean up the burning