Racing Plug 4735

[NGK R2525-9 Racing Spark Plugs 4735 ngk r2525-9-4735]
Racing spark plugs recommended for two-wheeled and four-wheeled vehicles come in various types designed to further enhance performance when used for racing, track driving, or with engines tuned for increased output.
Consequently, their shape differs from standard manufacturer-specified plugs, and there may be some compromise in plug lifespan and low-speed performance.
However, conversely, they are developed and designed to deliver full performance and withstand extremely tuned engines and very harsh operating conditions, with a wide range of heat ratings available.
Please select the appropriate plug for your individual engine to achieve full performance.
Precautions when choosing racing spark plugs:
From the part number of your genuine plug or currently used plug, check the thread size, plug type, and shape, then select the corresponding type.
Please refer to the manufacturer's website for guidance on choosing the ignition end 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 maintain the plug's ignition end temperature within the optimal range.
Simply increasing the heat rating will not improve engine performance.
Generally, heat ratings of 7-8 are used for street driving, 8-9 for track day specifications, and 9-10 for race specifications.
Regarding the presence or absence of a plug resistor, there is now little difference due to improved ignition system performance.
Resistor-type plugs will become the mainstream going forward.
Conversely, non-resistor type plugs may cause engine trouble in some models of some vehicle types.
In such cases, always use a resistor-type plug.
*The image is for illustration purposes only, and the design and specifications of the products shown may change without prior notice. Thank you for your understanding.