mrpike1973 Posted June 3, 2011 Share Posted June 3, 2011 hi i got a 15 hp boat moter light blue evinrude the model is 15804b from what i can tell its a 1978 but was told 84. not sure would just like to know the plug wire says it takes a l78v whats in it now is ql77jc4 champions is this right or the wrong plugs would just like to put new in also whats the gap thanks for any help Quote Link to comment Share on other sites More sharing options...
highlife4me Posted June 3, 2011 Share Posted June 3, 2011 Both plugs are recommended for your motor but if you do alot of trolling I would use the QL77JC4. They tend to foul less. Gap should be set at .030. Quote Link to comment Share on other sites More sharing options...
boatfixer Posted June 3, 2011 Share Posted June 3, 2011 Go with the QL77JC4 Quote Link to comment Share on other sites More sharing options...
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