The CR10EK and the CR10EIX plugs are the exact same plug, except the EIX is iridium. Any bike that calls for a CR9EK/CR10EK will fit the CR10EIX as well. The difference in iridium plugs isnt much, but they are supposed to reduce chance of fouling and burn more efficiently. You arent going to notice any gains switching your spark plugs.
Sorry for any confusion, but i believe i already stated the CR10EX is what it calls for, and getting the iridium plugs is not necessary. Heres a link to a thread on this exact question with some useful information.
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Last edited by PrepareForTakeOff; 03-30-2019 at 07:31 AM.