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spark plug help?

mrpike1973

By mrpike1973
in Boats & Motors.

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mrpike1973 Veteran

mrpike1973

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hi i have a 15 hp 1978 evinrude says it takes ql77jc4 champion plug, i also have a 1977 25 hp evinrude it has ac plug no# m40ffx in it now. i believe ql77jc4 champion plug is the same for the 25 hp having a hard time figuring this out thanks is the champion plug the same for both

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