Spark plug structure: The motorcycle spark plug looks small, but the material requirements are very high, and the whole is divided into an insulating part and a metal part. The metal part needs to have a certain thread so that it can be easily screwed into the cylinder.

The insulator part of the motorcycle spark plug (usually the ceramic body) runs through a central electrode, the upper end of which has a wire nut to carry the piezoelectric wire, and the lower end is welded with a ground electrode. Generally, there is a gap of 0.6-1.0 mm between the center electrode and the ground electrode. When the high voltage passes through this gap, sparks will be generated to ignite the mixture.
The most critical part of the motorcycle spark plug is the insulator. If the insulator does not work, the high-voltage electricity will "take a short path" and avoid the polar area so that no spark can be generated. Therefore, the insulator must have good resistance to high voltage, high temperature impact, chemical corrosion resistance, etc. Many spark plugs are made of alumina-based ceramics.
Through the above introduction and analysis of the structure of the motorcycle spark plug, hope it helps you.