Racing Plug 3857

【NGK R6725-105 Racing Plug 3857 ngk r6725-105-3857】
Racing plugs recommended for two-wheelers and four-wheelers come in various types designed to further improve performance when used in races, circuit driving, or with increased engine output due to tuning.
Therefore, their shape may differ from the standard plugs specified by the manufacturer, and plug life and low-speed performance may be slightly compromised.
However, conversely, they are developed and designed to perform well even in extremely tuned engines and under very severe operating conditions, with a wide range of heat ratings available.
Please select the appropriate plug for your individual engine to achieve its full potential.
Precautions when choosing racing plugs:
From the part number of your genuine plug or the plug currently in use, determine the thread size, plug type, and shape, then select the corresponding type.
Please refer to the manufacturer's website for how to choose the firing end shape.
The heat rating needs to be selected considering the increase in combustion temperature due to increased engine output and operating conditions, in order to maintain the plug's firing end temperature within the optimal range.
Simply increasing the heat rating alone will not improve engine performance.
Generally, heat ratings 7 to 8 are used for street driving, 8 to 9 for track day specifications, and 9 to 10 for racing 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 type plugs will become the mainstream.
Conversely, non-resistor type plugs may cause engine trouble in some models of some vehicle types.
In such cases, always use a resistor type plug.
*The image is for illustrative purposes only, and the design and specifications of the products shown may change without notice. Thank you for your understanding.