Re: What is the year and spark plug gap of my 15 hp Johnson
Welcome to Iboats!<br />J - Johnson<br />15 - 15hp<br />R - Rope Start<br />CS - 1980<br />D - Meaningless model run code.<br /><br />The year code works like this:<br />INTRODUCES<br />1234567890<br />So ED would be '96, since E=9 and D=6.<br /><br />Spark plug:<br />Champion QL77JC4 gapped at .030". You can try opening the gap up to .040" if you do a lot of trolling/idling.
