Racing Plug 4905

【NGK R7438-8 Racing Plug 4905 ngk r7438-8-4905】
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 increased engine output due to tuning.
Consequently, their shape differs from the manufacturer's standard plugs, and plug life and low-speed performance may be slightly compromised.
However, on the other hand, they are developed and designed to fully exhibit performance and withstand even 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.
Points to note 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 guidance on how to choose the ignition end shape.
The heat rating must be chosen to keep the plug's ignition end temperature within the optimal range, considering the increase in combustion temperature due to improved engine output and operating conditions.
Simply increasing the heat rating alone will not improve engine performance.
For mainly city driving, heat ratings 7-8 are typically used; for track day specifications, 8-9; and for race specifications, 9-10.
The presence or absence of a plug resistor now makes little difference due to advancements in ignition system performance.
In the future, resistor types will become mainstream.
Conversely, non-resistor types may cause engine trouble in some models of certain vehicle types.
In such cases, always use a resistor type.
*The image is for illustrative purposes only, and the design and specifications of the products shown are subject to change without notice. Please be aware of this.