曲轴油封损坏引起的故障一辆幸福２５０Ｃ型摩托车发生了难以启动的故障。当向气缸里滴几滴燃油后，便能启动了。启动后，不加油门，而转速自然升高。根据经验，摩托车出现上述的故障的原因有：①曲轴箱漏气；②化油器节气门不能复位。为此，对该机检查如下：（１）检查化... Crankshaft oil seal damage caused by a failure of a blessed 250C motorcycle hard to start the fault occurred. When the cylinder drops a few drops of fuel, they can start. After starting, no throttle, while the speed of natural increase. According to experience, the above motorcycle motorcycle failure reasons are: ① crankcase leaks; carburetor throttle can not be reset. To this end, the aircraft check as follows: (1) check ...