Updating for the record... The 2017+ 650 comes with standard plugs, not iridium (NGK MR8E-9). As of now, available at dealerships only in the US. No aftermarket or iridium cross reference.The spark plug replacement interval should be 20,000 mile for standard plugs over twice that for Iridium plugs. 2012+ 650s come stock with Iridium plugs.