What is the good plug # for a 4.5-HP Erude 1980 - the owner's manual says L77JC4 but from the web site http://www.boatsetup.com/SparkPlugChart.html they show a QL86C ??<br /><br />This engine is a kicker and it is doing mainly only low speed trolling.<br /><br />Thanks<br /><br />Smokey