Racing Spark Plugs 2739

【NGK R5674-10 Racing Plug 2739 ngk r5674-10-2739】
Racing plugs recommended for two-wheelers and four-wheelers come in various types to further improve performance when used in races, circuit driving, or with increased engine output due to tuning.
Therefore, their shape differs from the manufacturer's standard plug, and plug life and low-speed performance may be slightly compromised.
However, on the other hand, they are developed and designed to fully demonstrate performance and withstand even extremely tuned engines and very severe operating conditions, with a wide range of heat ratings up to high values.
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 you are currently using, determine the thread size, plug type, and shape, 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 range needs to be selected to maintain the optimal temperature range of the plug's firing end, taking into account the increased combustion temperature due to engine output improvement and operating conditions.
Simply increasing the heat range alone will not improve engine performance.
Generally, heat range 7-8 is used for city driving, 8-9 for track days, and 9-10 for racing.
The presence or absence of a resistor in the plug makes almost no difference nowadays due to improvements in ignition system performance.
Resistor types will become the mainstream in the future.
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.