Racing Plug 5167

【NGK R7239-10 Racing Plug 5167 ngk r7239-10-5167】
Racing plugs recommended for two-wheel and four-wheel vehicles come in various types designed to further improve performance when used in races, circuit driving, or with increased engine output due to tuning.
Consequently, their shape differs from the standard plugs specified by the manufacturer, and plug lifespan and low-speed performance may be slightly compromised.
However, on the other hand, they are developed and designed to fully demonstrate their performance even in extremely tuned engines or under very severe operating conditions, and are available in a wide range of heat ratings.
Please select the appropriate plug for your individual engine to achieve its full potential.
Precautions when choosing racing plugs:
Please check the screw size, plug type, and shape from the part number of your genuine plug or the plug you are currently using, and select the corresponding type.
Please refer to the manufacturer's website for guidance on how to choose the spark plug shape.
The heat rating needs to be selected to maintain the spark plug's firing end temperature within the optimal range, considering the increase in combustion temperature due to improved engine output and operating conditions.
Simply increasing the heat rating alone will not improve engine performance.
For mainly street use, numbers 7-8 are typically used; for track day specifications, numbers 8-9; and for race specifications, numbers 9-10.
The presence or absence of a resistor in the plug makes almost no difference nowadays due to improvements in ignition system performance.
In the future, resistor types will become the mainstream.
Conversely, non-resistor types may cause engine trouble in some models of some vehicle types.
In such cases, always use a resistor type.
*Images are for illustration purposes only, and the design and specifications of the products shown may change without prior notice. Please be aware of this.