Hello all --<br /><br />mercury 115 - 1986 <br /><br />Today checking the spark plug found some pitting, looks like the piston is just starting to burn.. All others look fine, #1 is ok #2 is the one starting. <br /><br />lookin in there see a small moon shape burn right on the top, somewhat flaky like i could knock it off but dont want to do that.<br /><br />If the carbs were lean would #1 have the same problem? <br /><br />Motor run well, thinking random spark issue in #2? <br /><br /> http://www.yogavayu.com/burn/piston2.JPG <br /> http://www.yogavayu.com/burn/piston2_a.JPG <br /><br />sorry u will have to zoom ms picture viewer works well..<br /><br />What should be my next steps/ change plugs see if pitting starts again<br /><br />maybe this was a temp probelm some other time as that i have not changed the plug in 2 years, would think if this was going on for 2 years would be worse?<br /><br />would change the power head but when changeing lower unit oil decent amount of metal on the lower drain screw, but lower unit run good.<br /><br /><br />thanks<br /><br />-tom
