有些机手认为 ,换件修理十分简单 ,把损坏的零件拆下 ,把购来的零件装上去就行了。其实不然 ,若马虎进行装配 ,轻则使功率下降、油耗增加、起动困难 ;重则损坏机器。因此 ,更换新件时必须注意以下事项 :（１）购新配件须注意零件质量 ,鉴别伪劣产品 ,注意零件是否次品 ;仔细检 Some drivers believe that the replacement repair is very simple, the damaged parts removed, the purchased parts to be installed on the line. In actual fact, if sloppy assembly, ranging from the power down, fuel consumption increases, difficult to start; heavy damage to the machine. Therefore, the replacement of new items must pay attention to the following matters: (1) purchase of new accessories should pay attention to parts quality, identification of inferior products, pay attention to whether the defective parts; carefully