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beasleys

Spark plug difference on 426

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I replaced my spark plug for the first time since I have owned the bike this weekend. I got a new plug from the dealer and it was a NGK CR9E. There was no problem with my old plug just some preventative maint. Well i pulled the old plug out and it was a NGK CR7E. What is the difference if any between the 2 plugs? I used the 9E from the dealer and worked fine, just wondering for future reference. Thanks :D

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The number represent a heat range, which is determined by the exposure of the ceramic cone.

http://www.ngk.com/faqmain.asp

Additionally, I would stick with the factory heat range unless you have a reason to run colder or hotter. And, the EK plugs (double electrodes) are better than the standard Es.

DaveJ

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Sorry to open an old thread but I have a ? Hope some one can help me. My '01 426 now has a CR9E and I have a new CR8EK. My question is what does the K mean. The manual says to use CR8E.

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The K indicates it is an iridium spark plug. It's the same heat range as the CR8E, but with the improvement of a precious metal electrode. The plug is less prone to fail to fire due to partial fouling, and will make the bike start more reliably. It should also last a lot longer. Perfect for your bike.

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