Reply To: 1975 Mercury 7 1/2 HP Spark Plugs

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October 27, 2023 at 7:51 pm #282111
David Stanton
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    Thanks guys for the info! I have worked on several similar Mercurys with surface gap plugs that worked fine, except I had one that when I got the idle right, it would not restart when warm without using the choke, even with the idle adjusted on the rich side. I didn’t try J6’s in that one because the owner was fine with choking it each time he started it.

    This owner of the 7-1/2 I posted about can’t afford new coils, and I’m out of good coils from parts motors, so I’ll leave it with some new J6Cs. Knowing this guy, I doubt he will ever even use the motor!
    Dave