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Right Spark Plug?

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I see some people using the NGK CR9EH-9 spark plug and others using CR8EH-9. I know that the 9 is a hotter plug, but does it really matter which one I get? 

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Posted (edited)

Unlike most other manufacturers, in NGK terminology the higher the number, the colder the heat range.

Edited by mlatour

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2 hours ago, hoobert said:

I see some people using the NGK CR9EH-9 spark plug and others using CR8EH-9. I know that the 9 is a hotter plug, but does it really matter which one I get? 

https://www.enginebuildermag.com/2011/05/understanding-spark-plug-heat-range/

Basically, if you are on the track all the time, go colder, if you are trail riding at less than balls-to-the-wall all day long go hotter. 

Verify with a plug chop (use Google when necessary).

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