E40F 汽油机在使用与维修时常常会遇到这样的情况:在汽油机的油、气等方面都没问题,点火时间、触点、火花塞、电容器、电路都检查调整恰当,操作正确的情况下,起动还很困难。起动后有断火现象,工作不稳定,会自动熄火。如把火花塞拆下,搭在机壳,转动曲轴,看其跳火情况,发现还有火花,有时还不错,但有时却时有时无、时强时弱。在这种情况下往往对故障难于作出正确的判断。在实践中发现,产生此种症状一般是由于点火线圈的次级线圈匝间短路所引起的。虽然电压降低了,但此时产生的电压还可以使大多数机子有火花。如果线圈断路还可以用万用表检查发现,而匝间短路时却 E40F gasoline engine often encountered in the use and maintenance of such a situation: the gasoline engine oil, gas and other aspects of no problem, ignition time, contacts, spark plugs, capacitors, circuits are checked and adjusted properly, the operation is correct, the start Still difficult. After the start off the phenomenon of fire, work is not stable, it will automatically turn off. If the spark plug removed, take the case, turn the crankshaft, see its flashover, and found that there are sparks, and sometimes good, but sometimes sometimes no, when strong and weak. In this case, it is often difficult to make a correct judgment of the fault. In practice, it has been found that such symptoms are generally caused by the inter-turn short circuit of the ignition coil. Although the voltage is reduced, but the voltage generated at this time can also make most of the machine sparks. If the coil open circuit can also be found with a multimeter test, but turn short circuit