An incorrect heating value can lead to serious damage to the engine or, at best, operational disturbances. A spark plug converts high voltage from the engine's ignition system into a "spark" at the top of the cylinder. Spark plugs have different heating values, which are often indicated as rising or falling numbers stamped on the plug itself. As a rule, a rising numerical value indicates a colder spot.

1 - Good condition

2 - Saturated with oil due to a problem in the piston

3 - Must adjust the "gap" to the correct opening

4 - Evidence that the spark plugs have not been changed for a long time and must be changed immediately

5 - Saturated with lead due to high percentage of lead in fuel

6 - Saturated with coal due to poor combustion, the fuel pump and air filter must be checked

7 - As a result of the engine temperature rising above normal speed. Will check why

8 - Must change fuel type to higher octane number (98). Maybe also non-return valves

9 - Evidence of mechanical problem or foreign body in the combustion chamber

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