I have a 150 hp Johnson 1995 model(J150EXEOM).When looking up spark plugs on this site I first went to the parts page for this model and open the spark plug page common replacement parts and it lists QL77Jc4 as the correct plug.But if you go to the exploded diagram page for the crankcase it shows QL82Yc as the plug. A local shop sold me the Ql82yc. Are these correct? Does one number replace the other.It has the Ql77jc4 in it now . The vro has been disconnected and the ql77jc4 plugs seem to foul quickly but it maybe due to over oiling as we premix in a 70 gallon inboard tank. Thanks
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