schwett

the ngk plug "zfr7f-11" is the copper version of the plug that comes with the car, but one step colder. it comes out of the box with a .44" gap (too much for FI). the plug "zfr7f" is the exact same plug, but with a .32-.35" gap out of the box. you can find the zfr7f in stock at most honda marine shops... i got a set of these, then got worried when i noticed that everyone else was running zfr7f-11. ngk confirmed for me that it's the same plug otherwise. they also said that even though the gap is specified with the plug, it should always be checked!