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Faulty Spark Plug
Posted: Mon Sep 28, 2015 7:47 pm
by SPR
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 plugs
Posted: Mon Sep 28, 2015 8:00 pm
by scumby
On the left plug the insulator is covering most of the electrode.
Posted: Tue Sep 29, 2015 3:08 am
by TJDave
Good eye Dr. Scumby!
Posted: Wed Sep 30, 2015 6:37 am
by Wrench
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.
Posted: Wed Sep 30, 2015 12:22 pm
by SPR
They are Champion plugs... lessons learned.