Faulty Spark Plug

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SPR
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Faulty Spark Plug

Postby SPR » Mon Sep 28, 2015 7:47 pm

See a problem with one of the plugs. Lawn mower sporadically ran on one cylinder when warmed up. The gaps are within specs for both plugsImage
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scumby
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Postby scumby » Mon Sep 28, 2015 8:00 pm

On the left plug the insulator is covering most of the electrode.
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TJDave
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Postby TJDave » Tue Sep 29, 2015 3:08 am

Good eye Dr. Scumby!
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Wrench
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Postby Wrench » Wed Sep 30, 2015 6:37 am

Are they both the same part number?

"Hotter" plugs have longer porcelain/electrodes. If they are identical, something must have gone wrong on the assembly line.

They look like Champion plugs, are they? I'm not a fan of Champion plugs. NGK have always been the most solid plugs for me.
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Postby SPR » Wed Sep 30, 2015 12:22 pm

They are Champion plugs... lessons learned.
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