四冲程发动机正常工作时排气管几乎不排烟或排出淡淡的白色烟雾,若排气管排出大量蓝烟、黑烟这都说明发动机存在问题,必须进行调整修复。 如果排气管排出蓝烟,说明有润滑油进入燃烧室参与燃烧,其原因有三种: 1.机油池内注油过多,过量的润滑油进入燃烧室造成发动机排气系统积存过多的烟垢。 When the four-stroke engine is working normally, the exhaust pipe emits little or no faint white smoke. If the exhaust pipe emits a large amount of blue smoke and black smoke, it indicates that the engine has problems and must be adjusted and repaired. If the exhaust pipe emits blue smoke, there are three reasons for the lubricant to enter the combustion chamber: 1. There is too much oil in the oil sump, and excess lubricating oil enters the combustion chamber causing too much smoke scale to accumulate in the engine exhaust system.