I changed my plugs on my 650 merc 65hp from some autolight 303 to some ngk's b7s. The first run on the plugs i noticed that i lost power and it wouldn't reach wot untile it started to plane then the rpm's came up. I haven't had the problem untile then. I gaped the plugs to .025. i checked the gap on the old ones that were in the boat when i got it and they were about .030 When i pulled the plugs all four were wet and had some slime on them. i have had they boat out a few times now and have all ways looked at the plugs after and never seen that slime. anybody know what is going on. the plugs # cross over between each other.
