About quality and texture - The CPR8EA-9 spark plug from NGK is a standard resister plug with a heat rating of 8, made using high quality processes and materials.About the feeling of use - After installing a big bore kit and using the generic internet recommended CR9E spark plug, I begain to have idling issues and difficultly restarting the engine when warm. After identifying the manufacture of the big bore kits recommendation of the CPR8EA-9 spark plug, these issues have now been resolved.Products to buy together - With the spark plug being a regular service item, key products to purchase when carrying out maintenance on my motorcycle would be crush washers, gaskets and the like as these products are cheap and convenient to have on hand.Difficulty of installation - The installation of the CPR8EA-9 spark plug is an simple task that took 0.2 of an hour to complete. Some mechanical aptitude and the use of basic hand tools is all that is required to firstly check the gap between the center electrode and the ground electrode and then install the spark plug onto the cylinder head.Cost performance and comparison with other products - I find the cost of all the products NGK sell to great value when compared to what most other companies sell their products for and the CPR8EA-9 spark plug is no different.About shipping and packaging - With there being no cost difference between sea freight and EMS for the CPR8EA-9 spark plug, I chose EMS for an earlier arrive date. The part was extremely well protected while being covered in bubble wrap and surrounded with air pillows in a sturdy cardboard box.Any concerns, cautions, or advice when purchasing - Webike Japan is the first place I look to for all my motorcycle needs. From service parts to performance products and even motorcycle gear and apparel, Webike always seem to satisfy my needs in regards to availability and pricing.
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5.09 USD (763 JPY) 5.6 USD Save 9%
Delivery Information
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Product detail
[Stock Number] 2306
[Shape] Screw type
[Size]
Screw Diameter: φ10.0mm
Screw length: 19.0mm
Hexagon dihedral width: Hex 16.0mm
[NGK part number] CPR8EA-9
[Type] Resister Plug
Plug unit and terminal image: [1-a] See image 6
[Heat Value] 8
[Compatibility Information] HONDA Stock Part Number Compatibility: 31916-KRM-841
YAMAHA OEM part number compatible: 94701-00415
Compatible KAWASAKI OEM part number: 92070-0029
**Even if you purchase in units of 10 pieces (1 box), it will not be delivered in 1 box.
*Terminals, tightening angle, etc. may differ depending on the model.Please refer to the link for the detailed fitting and installation instructions..
* The image is only for reference. The image shown may differ from the actual product.
Webike has all NGK plugs in stock! .
* The item may be temporarily out of stock due to manufacturer shortages, etc
Stable ignition performance and combustion efficiency at a reasonable price.It brings out the true performance of the engine.
[Features of Register plug]
A ceramic resistor is built in to suppress the ignition noise generated at the time of spark.
・The built-in ceramic resistor suppresses the ignition noise generated by the spark.
・Prevents radio noise in car radios, mobile hams, and car telephones.It also prevents the engine control computer from malfunctioning due to noise.
*The effect varies depending on the vehicle.
[About the shape of the plug terminal]
●Select a terminal shape that matches the engine and plug cord installation side.
There are three types of plug terminals: integrated type, separate type, screw type, and punch-and-caulk type.
Mainly, "integral type" and "punch caulking type" are used for four-wheeled vehicles and "screw type" for two-wheeled vehicles, and "separate type" is available for plugs used for both four-wheeled and two-wheeled vehicles.
In addition, the terminal part of the "separate type" can be removed, but the terminal part of the "integrated type" and "punch-and-caulk type" cannot be removed.If you try to remove it forcibly, the terminal part may be broken.
In case of using the "separate type" as the "screw type", remove the terminal nut.
When using the product with the terminal nut attached, make sure that it is not loose, and if it is loose, tighten it lightly with pliers or the like.
[Features of NGK plug] |
- This is a super "wide range" plug - |
The center electrode , The center electrode is a "copper cored" construction with copper sealed to near the tip to allow a large amount of heat to escape quickly. The result is an ultra "wide range" plug that is resistant to burning and smoldering. |
Comparing the thermal characteristics of plugs with copper cores and plugs without copper cores, the plugs with copper cores have superior thermal characteristics and fouling resistance, and a wider thermal range. |
■ Heat value of the plug |
- High alumina porcelain from New Ceramics is used as the insulator - |
- Excellent insulation at high temperature and reliable sparking. ・Excellent heat conductivity and prevents seizure. ・High thermal shock resistance (rapid heating and cooling) and excellent mechanical strength. |
- Strong and airtight in construction - |
Because the insulator and the main metal fittings are joined by special powder, it is excellent in airtightness and strong in structure. |
Special Nickel alloy electrodes are used for superior durability. |
- Corrugations in the insulator ensure good insulation and prevent flashover - |
During sparking, a high voltage is constantly applied between the terminal and the main unit bracket. High voltages try to leak along the surface of the insulator and flashover is more likely to occur if the required voltage between the spark gaps is high. In order to prevent flashover, insulator corrugations (folds) are provided to increase the insulator surface distance between the terminal and the main fittings to ensure insulation and prevent flashover. |
What is a flashover... |
It is a spark between the terminal and the main unit fitting as shown in the image. |
■ Flashover |
■The advantages of the plug |
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.