Racing Plug 4590

【NGK R7238-10 Racing Plug 4590 ngk r7238-10-4590】
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 engines tuned for increased output.
Consequently, their shape differs from standard manufacturer-specified plugs, and plug lifespan and low-speed performance may be slightly compromised.
However, conversely, they are developed and designed to fully demonstrate performance and withstand extremely tuned engines and very severe operating conditions, with a wide range of heat ratings.
Please select the appropriate plug for your individual engine to achieve full performance.
Important points when choosing racing plugs
Check the thread size, plug type, and shape from the part number of your genuine plug or currently used plug, and then select the corresponding type.
Please refer to the manufacturer's website for guidance on choosing the ignition tip shape.
The heat rating needs to be selected considering the increase in combustion temperature due to engine output improvement and operating conditions, in order to keep the plug's ignition tip temperature within the optimal range.
Simply increasing the heat rating alone will not improve engine performance.
For mainly street use, heat ratings 7-8 are commonly used; for track day specifications, 8-9; and for racing specifications, 9-10.
The presence or absence of a resistor in the plug makes almost no difference nowadays due to improvements in ignition system performance.
Resistor-type plugs will become mainstream in the future.
Conversely, non-resistor type plugs may cause engine trouble in some models of some vehicle types.
In such cases, please be sure to use a resistor-type plug.
*Images are for illustration purposes only. The design and specifications of the products shown are subject to change without notice. Thank you for your understanding.