故障现象:一辆CY80型摩托车,启动良好,怠速正常,空载加油发动机声音很大,但只要一挂挡,发动机即熄火。发动机启动后过几分钟,这种现象便可消失。 故障分析与排除:发动机启动良好,怠速正常,说明点火系统无故障。挂挡发动机熄火的故障原因有两种:一种是发动机动力不足;另一种是传动系统有故障。根据“空载加油时发动机声音很大”来看,发动机无故障,引起熄火的原因可能是传动系统有故障。又根据发动机加热几分钟后故障现象消失,说明故障应与发动机温度有关,而传动系中与发动机温度有关的只有变速箱内的润滑油。如果润滑油粘度过大,使离合器主、从动片粘在一起,挂挡时,车轮阻力会通过链条、齿轮,以及离 Symptoms: a CY80 motorcycle, start well, normal idle speed, no-load fuel engine sound great, but as long as a gear, the engine is off. A few minutes after the engine starts, this phenomenon can disappear. Failure Analysis and Troubleshooting: The engine starts well, idle speed is normal, indicating no fault ignition system. There are two reasons for the engine stalling due to engine failure: one is the lack of engine power; the other is the drive system is faulty. According to “no-load refueling engine sound is very large” point of view, the engine fault-free, cause of flameout may be the transmission system is faulty. And according to the engine heat a few minutes after the failure disappeared, indicating that the fault should be related to the engine temperature, while the transmission and the engine temperature is only the lubricating oil in the gearbox. If the oil viscosity is too large, so that the clutch main and follower stick together, hanging block, the wheel resistance through the chain, gear, and from