Ones that fit?
A number of folks have tried different brand plugs than the factory-recommended NGK CR7E spark plugs, and they got bad results. This is one time when Kawasaki got it spot on, because the bike just doesn’t run right if you use a different brand of plugs. NGK also offers the CR7E in the Iridium series. There is no “performance enhancement” claimed for these plugs, but they last considerably longer than the “traditional” variety. They’re more expensive (about double) than traditional, but according to the field data I’ve collected (admittedly sparse as of the time of this writing; few people have made the switch, and even fewer pile up the mileage quickly enough for a definitive sample), they last more than twice as long. Very few dealers will stock the Iridium plugs; you can order them, or the traditional CR7E (at a lower price) through sparkplugs.com.
