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New member here! Adrien in Temecula CA.

i have a 2005 ZX6R 636. replaced the stock plugs with the NGK CR9XIE and it was running rough. I pulled the plugs and all the gaps were gone as if the piston was hitting them. Are these plugs too long? Help! tks
 

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For your application......2005 ZX6R 636......CR9E (stock plug) AND CR9IEX (iridium alternative) show identical reach specs (19mm) per the actual NGK website. In theory, should be perfectly interchangeable and usable.

A good spark plug replace habit to get into is to line up what is coming out next to what is going in....do a last chance visual comparo to eliminate any error whatsoever....part number, packaging...any conceivable error.

So, you tell us...exactly what plugs *came out*? Did you compare? What went wrong?
 
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