Reply To: 1994 Evinrude 15 Spark Plug

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August 16, 2020 at 7:38 pm #211831
David Stanton
Participant

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    I would go with the NGK spark plug, I’ve worked on a couple of 9.9 Johnsons (same as the 15 except for carb) that just wouldn’t idle right with Champions and ran great with NGKs. Check again the number. The first site below equates a QL82C to an NGK BR7HS. Note that NGK plugs get colder as that number in the middle gets larger. I’ve noticed in the past there is some disagreement with heat range correlation between Champion and NGK depending on who’s chart you look at.
    Dave

    https://maxrules.com/OMCplugchart.html

    Here is NGK’s part finder:

    https://ngksparkplugs.com/en/part-finder