I had my 82' 25 HP Johnson out on the lake yesterday and lost one cylinder. I stopped and replaced the plugs and everything ran fine. However, on the top cylinder, there were some silvery metallic looking deposits all over the plug (I assume that's the one I lost). The bottom cylinder plug looked normal. The deposits looked like something that Silver Seal leaves in a car radiator. Several months ago, I accidentally ran the motor on one cylinder for several minutes. Could this be a result of built up fuel and oil finally being burned up? I'm running Penzoil synthetic blend oil. Should I stop using that oil? I am thinking of pulling the head to make sure there isn't any piston / cylinder damage. Any information you all might have would be greatly appreciated. <br /><br />Thanks, <br />Hopper
