Racing Plugs 6253

【NGK R6725-9 Racing Spark Plug 6253 ngk r6725-9-6253】
Racing spark plugs recommended for two-wheel and four-wheel vehicles are available in various types with the aim of further improving performance when used in races, circuit driving, or with increased engine output due to tuning.
Therefore, the shape differs from the manufacturer's standard plug, and the plug's lifespan 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 harsh 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 performance.
Precautions when choosing a racing spark plug
Please determine the screw size, plug type, and shape from the part number of your genuine plug or the plug you are currently using, and then select the corresponding type.
Please refer to the manufacturer's website for how to choose the firing end shape.
The heat range needs to be selected considering the increase in combustion temperature due to increased engine output and operating conditions, in order to maintain the firing end temperature of the plug within the optimal temperature range.
Simply increasing the heat range alone will not improve engine performance.
Generally, 7-8 heat range is used for street driving, 8-9 for track day specifications, 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.
Resistor types will become the mainstream in the future.
Conversely, non-resistor types may cause engine trouble in some models of some vehicle types.
In such cases, please be sure to use a resistor type.
*The image is for illustration purposes only, and the design and specifications of the products shown are subject to change without notice. Please understand.