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I still have the original plugs with 27,000 miles in our 950 vstar (unless the dealer changed them at 3377 miles prior to us taking purchasing). According to NGK's website, I would use Iridium IX : CPR7EAIX-9. Has anyone tried these?
 

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I prefer a more frequent change of standard plugs. Lets me see what's going on, and you get the new newness. Copper is a better conductor than the Iridium, they just have a much longer change interval.
 

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I just use the OE suggested plugs and change them yearly
 
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