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Old 06-16-2022, 05:48 PM
Bryan Janeway Bryan Janeway is offline
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Good day and thanks for reading,

Went to NAPA early this year and picked up new plugs. They didnít have 4 of my usual champion RJ12C but they did have 4 NGK BR6S. It was on the compatible list so no problem. Everything good early on but engine began running rough. Checked plugs and #1 really fouled. Did the pull the ignition lead while running and clearly #1 not banging. Pulled lead out of distributor and I could get the plug popping at a certain spot but couldnít secure it at that location. Got a little sparky thinking I might be able to . Had a spare distributor and rotor on board so thought I change those and it worked. Got out on the bay sailing and when trying to anchor at next spot clearly I didnít fix anything. #1 still not sparking was able to nurse it in but blah. Left the anchorage this morning and while sailing to next spot thought to stick one of the old plugs in the #1 hole. Would have changed leads but didnít have any. Problem solved ran the engine for about an hour and it was back to its singer sewing machine statusÖ..

Kinda looking for some more understanding. The NGK plugs on the other three cylinders seem good?? Could it be one plug or is it the one lead?? How would I check the plug or the lead for damage or continuity???Ö

Iíll purchase some new leads just to have on board. Wondering if I should just put last years champions back in?? Or hit four Canadian tires and get four new champs. No one seems to have more than one

Thanks and any advice would be great.

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Old 06-16-2022, 06:23 PM
Dave Neptune Dave Neptune is online now
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Bryan, you are describing a classic "bad plug", not real common but they're out there. If you had a good spark from that wire it has to be the plug.

If you wish to confirm just switch it out with another cylinder. If it follows the plug !!BINGO!!

Dave Neptune
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Old 06-16-2022, 06:33 PM
Bryan Janeway Bryan Janeway is offline
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Good thinking. Iíll do some experimenting back to the dock tomorrow.
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Old 06-17-2022, 02:40 PM
ArtJ ArtJ is offline
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I have used the NGK BR6S for many years. In fact they were carried
by the original Moyer parts person.

I have used NGK plugs in my cars, small yard engines and outboards
\All with excellent resukts

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