Racing Spark Plugs 4282

【NGK R7440A-10L Racing Plug 4282 ngk r7440a-10l-4282】
Racing plugs recommended for two-wheelers and four-wheelers are available in various types for the purpose of further performance improvement 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 their performance even in extremely tuned engines and very severe operating conditions, and are set to finely high heat ratings.
Please select according to your individual engine and unleash its full performance.
Important points when choosing racing plugs
Please check the screw size, plug type, and shape from the part number of the genuine plug or the plug you are currently using, and select the corresponding type.
Please refer to the manufacturer's website for how to choose the ignition tip shape.
The heat rating needs to be selected considering the increase in combustion temperature due to increased engine output and operating conditions, in order to maintain 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, numbers 7-8 are used, for track day specifications, numbers 8-9, and for race specifications, numbers 9-10.
Recently, due to improvements in ignition system performance, there is almost no difference whether a plug has a resistor or not.
Resistor-type plugs will become the mainstream in the future.
Conversely, with non-resistor types, there is a risk of engine trouble in some models of some vehicle types.
In that case, please be sure to use the resistor type.
*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.