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So if I run a regular CR9E plug is that hotter or colder than the CR9EIX?....LMAO BTW, the CR9E can be run and seems to work fine in the bike too at half the price.

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That all depends if you know what makes a plug a hotter plug or what makes a plug a colder plug.
It's not just the number alone!
A longer porcelain insulator will make a plug hotter, a shorter porcelain insulator will make the plug colder . Why? The longer insulator takes longer for the heat to get to the head. The shorter insulator is quicker at getting the heat to the head.

Now im not saying it is a whole hell of a big change in heat range but it's big enough that engine builders and racers will use these slight i would say half heat ranges to their advantage. We on the street could barely niotice running a copper core or an iridium .

I'm not trying to be a smart ass , a know it all or what ever ,or get personal with anyone even though it may seem that way to some people . I apologize for any misconseption as this is and never will be my intention. I'm only sharing my findings. I am certainly not trying to be a dick either but you are comparing apples to oranges. All plugs will have a different heat range however all plugs in the same group part# are identified with a number to identify the heat range. If you go buy a spark plug for you lawn mower like a CJ8 Champion for example of course its not the same heat range as a CR8E even though the number is the same, its a complety different design. My point is that the number identifies the heat range in that particular group of spark plugs. You are comparing different part number spark plugs and asking if the heat range is the same. Of course its not.

My point is simply this.

Look at the pic . Without knowing #'s! Can you spot the plug that is hotter??
Hint : they are arranged from hotter to colder



Now if you were to stay in the same plug # like, cr9e . cr7e, cr6e , etc. then going by numbers is accurate. But say you go to the cr9eh and try to compare the insulator to the cr9e what will you find ? You will find the cr9eh is a hotter plug cause the insulator is much longer. Same goes with cr9eix and the cr9eia-9 . Stay with the same #cr9eix, cr8eix, cr7eix etc. the heat ranges will stay accurate to their #, Compare both plugs of the same heat range # and i promise you will find the porcelain insulators will be different lengths, and they are enough to be a half a heat range.

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All the sparkplugs are a "#9" heat range can you believe it?
hot , warm ,cool
From left to right cr9eh , cr9eix, cr9e.
They are all a "half a heat range" different from each other.

Cr9e is a copper core and has almost no insulator when compared to the others. Would explain why some bikes with different setups , like a rich fuel map wont run right with the cr9e cause it is a little too cold of a plug and will not burn off excess fuel . But when they put the stock type back in their bikes run right even both plugs are "#9's"

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[ I am certainly not trying to be a dick either but you are comparing apples to oranges. All plugs will have a different heat range however all plugs in the same group part# are identified with a number to identify the heat range. If you go buy a spark plug for you lawn mower like a CJ8 Champion for example of course its not the same heat range as a CR8E even though the number is the same, its a complety different design. My point is that the number identifies the heat range in that particular group of spark plugs. You are comparing different part number spark plugs and asking if the heat range is the same. Of course its not.

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whats a spark plug

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google is you friend

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oem plugs rock

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