Racing Plug 4741

【NGK R6252E-9 Racing Plug 4741 ngk r6252e-9-4741】
Racing plugs recommended for two-wheeled and four-wheeled vehicles come in various types designed to further improve performance when used in races, circuit driving, or with engines whose output has been increased through tuning.
Therefore, their shape differs from the manufacturer's standard specified plugs, and plug life and low-speed performance may be slightly compromised.
However, conversely, they are developed and designed to fully demonstrate their performance and withstand even extremely tuned engines and very severe operating conditions, with a wide range of heat ratings set.
Please select the appropriate plug for your individual engine to achieve its full potential.
Precautions when choosing racing plugs
Please check the thread size, plug type, and shape from the part number of the genuine plug or the plug you are currently using, and then select the corresponding type.
Please refer to the manufacturer's website for guidance on how to choose the firing end shape.
The heat rating needs to be selected to keep the firing end temperature of the plug within the optimal temperature range, taking into account the rise in combustion temperature due to increased engine output and operating conditions.
Simply increasing the heat rating alone will not improve engine performance.
Generally, heat ratings of 7-8 are used for street driving, 8-9 for track days, and 9-10 for race specifications.
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 problems in some models of some vehicle types.
In such cases, please be sure to use a resistor type.
*The image is for illustrative purposes only, and the design and specifications of the products shown may change without prior notice. Thank you for your understanding.