NGK Spark Plug Dpr7Ea-9

When tuning an engine, the correct heat range of the spark plug is important; otherwise, the cylinder may overheat or the spark plug may become constantly fouled. A cold spark plug transfers more heat to the cylinder head, but the electrode tends to foul because it does not reach the cleaning temperature. A hot spark plug transfers less heat to the cylinder head, so caution is advised, as the cylinder may overheat, risking piston seizure. As a rule, colder plugs (e.g. Bosch W2...) are used for racing cylinders, while for sport cylinders and standard cylinders we recommend a slightly hotter plug (e.g. Bosch W3... to W4...). Many tachometers require an anti-interference spark plug to function properly. Without anti-interference plugs, extreme fluctuations or even absurd RPM readings often occur. If you have a tachometer, go for the slightly more expensive anti-interference plugs. Your tachometer will thank you.. In the selection list, we have provided the equivalent Bosch plug heat range in brackets.

Spark plug with threaded reach (19mm)