Spark Plug Reading Chart. Code 5 defines that it is a moderate spark plug with a medium hit range. 002004 mm1000 km 0000126000252 inches1000 miles.
The porcelain the housing ring around the porcelain the strap or outer electrode the center electrode shape and the threads. The relief also serves as a pilot guiding a plug straight into the plug hole. A normal spark plug will have brown or grayish-tan deposits on the side electrode.
Dont Leave HP On The Table.
SO in the 70s and. Spark Plug Reading Chart. The lower the number the hotter the spark plug will be. The porcelain is the insulator between the center electrode and the spark plug housing.