Racing Plug 3856

[NGK R5673-9 Racing Plug 3856 ngk r5673-9-3856]
Racing plugs, recommended for two-wheeled and four-wheeled vehicles, are available in various types aimed at further performance improvement 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 set in fine increments.
Please select the appropriate plug for your individual engine to fully unleash its performance.
Points to note 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 select the corresponding type.
Please refer to the manufacturer's website for guidance on how to choose the igniter tip shape.
The heat rating needs to be selected by considering the increase in combustion temperature due to increased engine output and operating conditions, in order to keep the plug's igniter tip temperature within the optimal range.
Simply increasing the heat rating alone will not improve engine performance.
For mainly street use, numbers 7 to 8 are generally used; for track day specifications, 8 to 9; and for race specifications, 9 to 10.
The presence or absence of a resistor in the plug makes almost no difference nowadays due to advancements in ignition system performance.
Resistor-type plugs will become the mainstream in the future.
Conversely, non-resistor type plugs may cause engine trouble in some models of certain 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 are subject to change without notice. Please be aware of this.