What are the NGK spark plug models?

[VonLaura]

NGK spark plug models start with a letter that represents the thread diameter of the spark plug. For example, B represents a 14MM thread, C represents a 10MM thread, and D represents a 12MM thread. Here's an example: For the BKR6E spark plug, BK indicates a 14MM thread diameter, ISO standard length spark plug, R stands for a resistor type, 6 represents the heat range, and E denotes a 19MM thread reach. Below are some considerations for selecting spark plugs: 1. When choosing a spark plug: It is essential to select a spark plug with the correct model number. 2. If it doesn't match the engine: Using a spark plug with an incorrect model number or heat range may cause unstable engine speed or poor driving performance. During high-speed operation, the engine produces significantly more power bursts per unit time compared to low and medium speeds.