CARBON BUILT-UP PROOF SPARK PLUG

The utility model belongs to the component of the gasoline engine, which is a second generation of the double-gap serially connected spark plug, and still has serially connected inner spark gap and outer spark gap. The configuration of the utility model is also provided with a glass cover on the upper end of an iron case. The upper end of the glass cover is provided with a gum cap, however, the assembly of a porcelain core, the iron case and a central electrode is changed into the assembly from the top down, and is bound by glues, and therefore, the hot sealing and the hot strength are improved a lot. The upper end of the porcelain core is added with a rubber septum which causes the electrode fly objects of the outer spark gap to be easily cleaned. The utility model also discloses a waterproof glue cap which thoroughly solves the influences of the fog and the heavy rain on the ignition. When the river water immerses the spark plug when the river is crossed, the spark plug can be normally ignited.